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One of the most common objections to the jizya is straightforward. Under Muslim rule, some non-Muslim subjects paid this tax while Muslims did not. The word appears once in the Qur’an, in a verse that tells Muslims to fight certain opponents until they pay the jizya, and the verse closes with a phrase commonly translated as “while they are humbled.”1 It can therefore look like a fine for refusing Islam, or a way to make conversion financially attractive.

That objection cannot be answered by denying the difference in treatment. The jizya was tied to religious status, and it could place real financial pressure on the people who paid it. But the legal arrangement was more specific than a simple charge for holding the wrong religion. The rules limited liability to a particular group, exempted those who could not serve or pay, placed different obligations on Muslims, and required the state to protect those from whom it collected the tax.

A few terms will be used throughout. Jizya is the tax itself. Dhimma is the covenant of protection extended by a Muslim state to its non-Muslim subjects, and ahl al-dhimma, often shortened to dhimmi, are the people covered by that covenant. Zakat is the obligatory annual charity required of Muslims. A hadith is a report of something the Prophet ﷺ said or did whose reliability is assessed by specialists. Sahih al-Bukhari and Sahih Muslim are the two most rigorously screened collections.

The objection

The objection has three parts. First, non-Muslims paid the jizya while Muslims did not, and conversion ended the liability immediately. Taken by itself, that makes the tax appear to follow religious belief alone.

Second, Qur’an 9:29 connects the payment to fighting and ends with language associated with humiliation. This raises the question of whether subordination was not merely a consequence of defeat but part of the purpose of the tax.

Third, legal compulsion does not have to take the form of a direct order to convert. A continuing tax on one religious community can influence belief through financial pressure. Some people may convert simply to escape the cost, even if no official tells them to accept Islam.

A serious account must therefore explain who paid, what the payment was for, and whether it encouraged conversion. Leaving out any one of these questions produces an incomplete picture.

What the jizya was

In the classical legal arrangement, the jizya was paid by non-Muslim men of military age who had the means to pay. In return, they were exempt from military service and received the state’s protection. This protection was not presented as a favour that the ruler could grant or withdraw at will. It formed part of the dhimma, a covenant that placed duties on the Muslim authorities collecting the tax.

Those duties appeared in written agreements. In the treaty with the people of Hira, the protected party states its right directly: “the Muslims and their leader protect us from those who would oppress us, whether they be Muslims or others.”2

This is not how a system designed merely to degrade non-Muslims would work. The covenant bound Muslim authorities to protect them from abuse, including abuse by Muslims, and from foreign armies. It imposed duties on the rulers who issued it rather than giving them a free hand.

The category was also narrower than “everyone who is not Muslim.” Non-Muslims outside Muslim territory did not pay it, nor did non-Muslim allies. It applied to non-Muslim subjects living under a particular political covenant. Religious identity mattered, but it operated within that legal relationship rather than as the only condition of liability.

Who paid, and who did not

The exemptions are central to understanding the tax. Across all four Sunni schools of law, liability was restricted to free, adult, sane, non-Muslim men who were physically capable and able to pay.3 Women and children were exempt, as were the elderly, the poor, people dependent on charity, the chronically ill, the disabled, and the blind. Monks and clergy living in monasteries were also excluded.

Military service removed the liability as well. A non-Muslim who fought alongside Muslim forces paid no jizya because service and payment were treated as alternatives to one another.4

The exemptions show that liability followed the group a state could conscript: adult men physically and financially able to serve. If the jizya had simply been a charge for holding another religion, it would also have applied to women, children, monks, the elderly, the poor, and those unable to fight. It did not.

This point matters because a tax imposed purely for religious difference would naturally fall on every member of the other religion. The jizya did not. Its liable group closely matched the group from which a pre-modern state could demand military service.

The law also addressed what happened when a payer could no longer support himself. Abu Yusuf, the Hanafi jurist who served as chief judge under Harun al-Rashid and wrote the earliest surviving manual of Islamic public finance, held that when a man became destitute or infirm, his liability ended and his support became a charge on the public treasury.5 The system did not merely stop collecting from those unable to pay. In its juristic form, it required the state to maintain them.

What Muslims owed instead

Muslims did not pay the jizya, but they were not free of fiscal and military obligations. They paid zakat, an annual obligation assessed at two and a half per cent of accumulated wealth, and they remained liable for military service. A dhimmi did not pay zakat and was normally exempt from conscription, with the jizya corresponding to that exemption.

This does not mean that the two systems were financially identical. Zakat was assessed on wealth, while the jizya was generally assessed per liable man. Their actual burdens varied by province, period, wealth, and enforcement. Military service also carried a cost that cannot be reduced to a tax rate: the risk of injury or death.

Neither status was automatically cheaper. The burden varied by year, province, and personal wealth. Muslims and non-Muslims carried different obligations, while military service also brought the risk of injury or death.

The relevant comparison is therefore not between a taxed non-Muslim and an untaxed Muslim. It is between two different sets of obligations within a pre-modern state: jizya and exemption from conscription on one side, zakat and military liability on the other.

The verse, in full

The jizya appears only once in the Qur’an, in verse 9:29:

“Fight those who do not believe in Allah or in the Last Day and who do not consider unlawful what Allah and His Messenger have made unlawful and who do not adopt the religion of truth from those who were given the Scripture — [fight] until they give the jizyah willingly while they are humbled.” (Sūrat al-Tawbah 9:29), Saheeh International

﴿قَٰتِلُوا۟ ٱلَّذِينَ لَا يُؤْمِنُونَ بِٱللَّهِ وَلَا بِٱلْيَوْمِ ٱلْءَاخِرِ وَلَا يُحَرِّمُونَ مَا حَرَّمَ ٱللَّهُ وَرَسُولُهُۥ وَلَا يَدِينُونَ دِينَ ٱلْحَقِّ مِنَ ٱلَّذِينَ أُوتُوا۟ ٱلْكِتَٰبَ حَتَّىٰ يُعْطُوا۟ ٱلْجِزْيَةَ عَن يَدٍۢ وَهُمْ صَٰغِرُونَ ۝٢٩﴾ سُورَةُ التَّوۡبَةِ

Read without context, the verse can sound like a general command to fight non-Muslims until they accept a humiliating status. The surrounding legal and Qur’anic framework points to a more limited reading. The verse addresses an existing war and states the settlement by which the fighting can end. The opposing population may remain non-Muslim while entering a political agreement with the Muslim state.

Two questions still need to be separated. The first is whom the verse permits Muslims to fight. The second is what its closing phrase requires once the jizya is paid. The Qur’an’s other rules on warfare bear on the first question, while classical exegetical disagreement bears on the second.

It is addressed to a war already under way

Verse 9:29 was revealed in the setting of an existing conflict, around the Tabuk expedition on the Byzantine frontier. It tells Muslims what settlement they may accept and when the fighting is to stop. The stated condition is payment, not conversion.

This reading fits the Qur’an’s broader rules for war. Elsewhere, it directs Muslims to fight those who wage war against them and forbids transgression:

“Fight in the cause of Allah ˹only˺ against those who wage war against you, but do not exceed the limits. Allah does not like transgressors” (Sūrat al-Baqarah 2:190), Dr. Mustafa Khattab, The Clear Quran

﴿وَقَٰتِلُوا۟ فِى سَبِيلِ ٱللَّهِ ٱلَّذِينَ يُقَٰتِلُونَكُمْ وَلَا تَعْتَدُوٓا۟ ۚ إِنَّ ٱللَّهَ لَا يُحِبُّ ٱلْمُعْتَدِينَ ۝١٩٠﴾ سُورَةُ البَقَرَةِ

It separately rejects compelled belief:

“Let there be no compulsion in religion” (Sūrat al-Baqarah 2:256), Dr. Mustafa Khattab, The Clear Quran

﴿لَآ إِكْرَاهَ فِى ٱلدِّينِ﴾ [سُورَةُ البَقَرَةِ: ٢٥٦]

The Qur’an also requires kindness and fairness toward non-Muslims who are not fighting Muslims or expelling them from their homes:

“Allah does not forbid you from dealing kindly and fairly with those who have neither fought nor driven you out of your homes. Surely Allah loves those who are fair” (Sūrat al-Mumtaḥanah 60:8), Dr. Mustafa Khattab, The Clear Quran

﴿لَّا يَنْهَىٰكُمُ ٱللَّهُ عَنِ ٱلَّذِينَ لَمْ يُقَٰتِلُوكُمْ فِى ٱلدِّينِ وَلَمْ يُخْرِجُوكُم مِّن دِيَٰرِكُمْ أَن تَبَرُّوهُمْ وَتُقْسِطُوٓا۟ إِلَيْهِمْ ۚ إِنَّ ٱللَّهَ يُحِبُّ ٱلْمُقْسِطِينَ ۝٨﴾ سُورَةُ المُمۡتَحنَةِ

Taken together, these passages do not support a general command to attack people simply because they follow another religion. They distinguish enemies at war from non-Muslims at peace, forbid forced belief, and allow the fighting in verse 9:29 to end without the defeated community converting.

The closing phrase

The verse closes with the words ʿan yadin wa-hum ṣāghirūn:

﴿حَتَّىٰ يُعْطُوا۟ ٱلْجِزْيَةَ عَن يَدٍۢ وَهُمْ صَٰغِرُونَ﴾ [سُورَةُ التَّوۡبَةِ: ٢٩]

The phrase ʿan yadin literally means “from a hand,” but exegetes did not give it a single explanation. Some understood it as willing and direct payment from one’s own hand rather than through an intermediary. Others took yad in the sense of capacity or power, so that the payment was made according to one’s means. The tiered rates found in the legal literature fit this second reading.6

The more difficult term is ṣāghirūn, often translated as “humbled.” Al-Shafi’i, founder of one of the four Sunni schools of law, understood it as submission to the state’s law: accepting the authority of a jurisdiction one had not chosen. Other exegetes, including al-Tabari, transmitted reports describing a visible show of submission at the moment of payment.7

That disagreement should be stated plainly. Some reports did attach a ritual of subordination to collection, and later jurists sometimes developed that idea in degrading ways. But the term did not grant officials an unrestricted right to strike, torment, or humiliate the payer. Jurists prohibited such abuse, and Prophetic reports were invoked against officials who practised it.

What the covenant obliged Muslims to do

The dhimma did not consist only of obligations imposed on non-Muslims. It also created serious duties for Muslim rulers and officials. The Prophet’s ﷺ instructions treated the life of a covenanted non-Muslim as inviolable. Killing one was described as an offence whose consequences reached into the Hereafter:

“Whoever killed a Mu’ahid — a person granted the pledge of protection by the Muslims — shall not smell the fragrance of Paradise, though its fragrance can be smelt at a distance of forty years of travelling.” — Sahih al-Bukhari 6914; also Sunan an-Nasa’i 4749–4750, graded sahih, with the wording ahl al-dhimma8

The same protection governed the collection of the tax. When Hisham ibn Hakim saw a governor of Hims forcing Coptic Christians to stand in the sun until they paid, he intervened. He cited a saying he had heard directly from the Prophet ﷺ:

“I heard the Messenger of Allah ﷺ say: Allah Most High will punish those who punish people in this world.” — Sunan Abi Dawud 3045, graded sahih; the Prophetic saying also in Sahih Muslim 26139

Hisham did not treat the Prophetic warning as an abstract rule. He used it against a serving governor to stop the coercive treatment of Coptic Christians during tax collection.

Another report makes the Prophet ﷺ the adversary of anyone who exploits a covenanted non-Muslim: “if anyone wrongs a covenanted man, or diminishes his right, or forces him to work beyond his capacity, or takes from him anything without his consent, I shall plead against him on the Day of Judgment.”

Sunan Abi Dawud 3052. Scholars disagree over its reliability: two assessments grade it sahih, while a third grades it daif (weak). It supports the two stronger reports above but is not used as independent proof.

The three reports do not carry identical evidentiary weight, and the weaker one should not be treated as though it does. Their direction, however, is consistent. The covenant was not merely a demand for payment. It gave protected non-Muslims rights that Muslim authorities were religiously and legally bound to respect.

When the state could not deliver, the money went back

Protection was not merely attached to the jizya in theory. Early Muslim commanders treated it as a condition of collection. If the state could no longer protect the population, it was no longer entitled to keep the money.

Before the battle of Yarmuk, a large Byzantine army advanced while Muslim forces withdrew from Syrian cities they could not defend. Abu Ubayda ibn al-Jarrah ordered the jizya returned to the inhabitants of Hims and instructed commanders in the other conquered cities of the Levant to do the same. The tax had been collected in return for protection, and that protection could no longer be provided.10

Khalid ibn al-Walid had expressed the same principle in a treaty: “If we are able to protect you, we deserve the collection of the jizya; otherwise we shall not.”11

The refund was not symbolic. It shows that protection was part of the exchange itself, not a justification added later. The commanders returned the money while the treasury was under pressure and an army was advancing.

This is strong evidence for how the arrangement was understood by those early commanders. They did not consider the treasury entitled to the tax regardless of its own conduct. The state’s right to collect depended on its ability to fulfil the covenant.

The rates

Abu Yusuf records a three-tier annual assessment based on wealth: forty-eight dirhams for the rich, twenty-four for those of middling means, and twelve for craftsmen and manual labourers.12 The exact rates differed by time and place, but the important feature is that the juristic model did not treat every payer as equally able to bear the charge.

The tax applied annually to each liable adult man, not to women, children, or the household as a whole. A man who became unable to pay was no longer liable. Abu Yusuf ruled that the obligation did not apply to the decrepit, chronically ill, or destitute, and that the public treasury should instead meet their family expenses.5

These protections did not make the jizya harmless. A head tax can still be regressive because even a lower fixed amount consumes a greater share of a poor person’s resources. What the rules show is narrower but still important: the legal model recognized differences in wealth, reduced the rate for poorer workers, and exempted those without the means to pay.

Where the criticism does land

The governing rules did not prevent abuse. At different times, rulers and jurists used the jizya or the broader dhimma system in ways that were plainly humiliating.

The discriminatory dress codes known as ghiyar, enforced by the Abbasid caliph al-Mutawakkil from around 850 CE, were intended to mark out and degrade non-Muslims. These rules have no basis in the Qur’an or in the practice of the Prophet ﷺ and the early caliphs.13

Some later jurists also described degrading rituals during collection, including striking or seizing the payer as he handed over the money. Major figures within the tradition rejected these practices as baseless. They arose from particular commentaries and local customs, not from the governing Prophetic rules on how covenanted non-Muslims were to be treated.

A later political use of the tax appeared in Mughal India. Aurangzeb reimposed the jizya in 1679, more than a century after Akbar had abolished it. The measure was directed at a Hindu majority and was understood politically by contemporaries.14

These were genuine abuses, not inventions of modern critics. They should not be denied, softened, or explained away. But neither should they be confused with the whole legal structure. Each departed from important restrictions already discussed, especially the limits on who could be charged and the rules against abusing those who paid.

Did it drive conversion?

Even under lawful collection, the jizya gave non-Muslims a financial reason to convert. The historical evidence indicates that this incentive affected at least some conversions.

Mohamed Saleh and Jean Tirole use Egyptian papyrological tax records and later census data to study this effect. Because a poll tax is a fixed charge per person, it takes a larger share of a poor person’s resources than a rich person’s. Their evidence indicates that poorer Copts converted at higher rates, leaving a smaller and comparatively wealthier Coptic minority by 1200.15

The process was gradual. Egypt’s religious transformation unfolded over roughly five and a half centuries, from the conquest in 641 to around 1200. The country remained majority-Christian for much of that period under Muslim rule.15 This does not remove the role of financial pressure, but it does not fit the claim that the population was simply forced to convert at the point of conquest.

Conversion also created a problem for the state. Once a person became Muslim, he no longer owed the jizya. Every conversion could therefore reduce tax revenue. Under the Umayyads, the resulting losses in Egypt, Iraq, and Khurasan were serious enough that some provincial governors resisted conversion or continued collecting from men who had already become Muslim.16

The caliph Umar ibn Abd al-Aziz (r. 717–720) ordered the tax removed from converts despite the loss of revenue and the objection of his governor in Khurasan. When a delegation complained about the fiscal consequences, Umar’s reported answer was direct: “Muhammad was sent as a prophet and not as a tax collector.”17

The episode exposes a real tension in the system. A government could benefit from keeping people within the taxed category, while genuine conversion removed them from it. Umar’s order placed the religious rule above the state’s fiscal interest.

What remains of the objection

The central criticism cannot simply be dismissed. A tax imposed according to religious status can pressure belief even when no one is threatened, beaten, or ordered to convert. The state may also acquire a financial interest in keeping people within the taxed community. The legal purposes of the jizya do not erase that effect.

But this effect does not explain the tax in full. The jizya corresponded to exemption from military service and bound the state to protect the payer. Officials returned it when they could no longer provide that protection, and a Prophetic warning was used against a serving governor who abused Coptic Christians during collection. A payment tied to these obligations cannot be reduced to a penalty for holding another religion, even though it could create an incentive to convert.

The degree of pressure also depended on assessment and enforcement. Saleh and Tirole found that the poor converted at higher rates, which shows the harm a regressive head tax could cause. Abu Yusuf’s model, by contrast, used rates banded by wealth, exempted the destitute, and placed their support on the public treasury. Those legal protections would reduce the pressure if applied, but their existence does not prove that every administration applied them consistently.

The same distinction is necessary when discussing humiliation. Al-Mutawakkil’s dress codes and Aurangzeb’s reimposition were coercive in intent. Classical and modern Muslim scholars have criticised both as departures from the standards found in the governing sources.

The conquests themselves, and the wider claim that Islam spread by force, are treated in Did Islam Spread by the Sword?.

The category no longer applies

The jizya belonged to a political order in which military and fiscal duties were divided by religious community. Muslim men could be called to military service, while protected non-Muslim men paid the jizya and were exempt. Once that division disappears, the exchange on which the tax rested disappears with it.

Modern states generally impose taxes and military obligations through common citizenship rather than religious status. Egypt’s Dar al-Ifta, among other authorities, therefore holds that non-Muslims who possess full legal citizenship and bear equal public duties are not liable for jizya. The condition that created the obligation no longer exists.18

This conclusion follows from the structure of the arrangement itself. A payment contracted in exchange for exemption from military service ends when that exemption ends. To preserve the jizya after equal citizenship and equal military duties have replaced the dhimma system would preserve the charge while removing the legal exchange that justified it.

Conclusion

The jizya was not simply a fine imposed on every person who refused Islam. It was a tax within a pre-modern system that divided public obligations by religious status. Liability was limited to adult non-Muslim men who were physically and financially able to serve. Women, children, monks, the elderly, the poor, and those unable to fight were exempt. A non-Muslim who joined the army was exempt as well, while Muslims bore zakat and military service instead.

The payment also formed part of a covenant. Muslim authorities were required to protect the people who paid it from foreign attack and from abuse by Muslims themselves. Early commanders returned the tax when they could no longer provide that protection. These features would make little sense if degradation were the whole purpose of the system. The covenant restricted the authorities who issued it rather than granting them a free hand over a disfavoured population.

The difficult evidence remains. The word ṣāghirūn was interpreted in more than one way. Some exegetes understood it as submission to the state’s law, while others described visible submission during payment. Later rulers and jurists sometimes turned this language into deliberate humiliation. Those practices were real, but they conflicted with the Prophetic warnings against mistreating covenanted non-Muslims and with Hisham ibn Hakim’s intervention against a governor’s coercive collection.

The financial pressure was real as well. A head tax could weigh most heavily on poor members of the taxed community, and the Egyptian evidence indicates that this affected conversion over several centuries. The legal rules tried to limit that burden through tiered rates, exemptions for the destitute, and public support for those unable to pay. They did not remove every financial incentive, nor did they guarantee just enforcement in every place and period.

The most accurate conclusion is therefore not that the jizya was religious extortion with no other purpose, nor that it created no pressure at all. It was part of a historical system in which exemption from military service, payment, and a binding right to protection were connected. That system no longer applies where citizens share the same taxes, military obligations, and legal status regardless of religion.


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Notes

Qur’an verses cited

  • 2:190 — fighting restricted to those who fight first, and no exceeding the limits
  • 2:256 — no compulsion in religion
  • 9:29 — the jizya verse, and ʿan yadin wa-hum ṣāghirūn
  • 60:8 — kindness and fairness owed to non-Muslims who are not at war with Muslims

Further reading

  • Abu Yusuf, Kitab al-Kharaj — the earliest surviving manual of Islamic public finance, written for Harun al-Rashid
  • Al-Baladhuri, Futuh al-Buldan; trans. Philip Hitti, The Origins of the Islamic State
  • Thomas W. Arnold, The Preaching of Islam: A History of the Propagation of the Muslim Faith
  • Mohamed Saleh and Jean Tirole, Taxing Identity: Fiscal Policy and Conversions in Early Islam — quantitative work on Egyptian conversion, 641–1200, including the regressive impact of jizya on conversion
  • Dar al-Ifta al-Misriyya, Were Christians Forced to Pay the Jizyah to Spare Their Lives?
  1. Qur’an 9:29. It is the only occurrence of the word jizya in the Qur’an. 

  2. The treaty terms are quoted in the fatwa of Dar al-Ifta al-Misriyya, Were Christians Forced to Pay the Jizyah to Spare Their Lives?, which cites Thomas W. Arnold, The Preaching of Islam, 79–81, for the treaties of Khalid ibn al-Walid, Suraqa ibn Amr, Habib ibn Maslama al-Fihri and Abu Ubayda ibn al-Jarrah. 

  3. For the Hanafi statement of the exemption — children, women, the old, the disabled, the blind, the poor who cannot work, and monks who keep to their monasteries — see SeekersGuidance, Is It True That Some Non-Muslims Are Exempt from Jizya?. Mufti Muhammad Shafi’s Maarif al-Qur’an on 9:29 gives substantially the same list — women, children, the aged, religious leaders in seclusion, the disabled and the handicapped — reproduced on Quran.com. That the other three schools agree on the substance of the list is widely reported in the secondary literature but has not been checked here against their primary manuals. [unverified] 

  4. Dar al-Ifta al-Misriyya, as above: participation in the defence of the territory discharged the obligation, being treated as the equivalent of the service the tax replaced. 

  5. Abu Yusuf (d. 798), chief judge under Harun al-Rashid, Kitab al-Kharaj, written at the caliph’s request: the obligation lapses for the decrepit, the chronically ill and the destitute, and such a man’s maintenance falls on the public treasury. Quoted here from circulating English translations of the Kharaj rather than from a critical edition; for a scholarly text see the Brill edition, Abu Yusuf’s Kitab al-Kharaj. The wording has not been checked against the Arabic. [unverified]  2

  6. Both readings of ʿan yadin are standard. Maarif al-Qur’an on 9:29 takes yad in the sense of “power and subjugation”; the reading “with a willing hand,” and the reading taking yad as financial capacity, are given in Muhammad Asad’s note on the verse in The Message of the Qur’an

  7. “Imam al-Shafi’i interpreted this as meaning they should subscribe to the common law of Islam and take the responsibility of remaining obedient to it” — Mufti Muhammad Shafi, Maarif al-Qur’an on 9:29, reproduced on Quran.com. That al-Tabari transmits reports describing a posture of submission at the moment of payment is reported in the secondary literature on this verse; his Jami’ al-Bayan has not been consulted directly here. [unverified] The disagreement among exegetes on this word remains unresolved. 

  8. Sahih al-Bukhari 6914. Parallel wording with ahl al-dhimma at Sunan an-Nasa’i 4749 and 4750, both graded sahih; also Sunan Ibn Majah 2686–2687 and Jami’ at-Tirmidhi 1403, graded sahih

  9. Sunan Abi Dawud 3045, graded sahih, cross-referenced by the collection’s editors to Sahih Muslim 2613 for the Prophetic saying. 

  10. The return of the jizya before Yarmuk is reported in al-Baladhuri, Futuh al-Buldan. The episode is cited in Dar al-Ifta al-Misriyya’s fatwa above and in Arnold, The Preaching of Islam. It is a report from the early historical literature rather than a hadith, and carries the evidentiary weight of that genre. 

  11. Khalid ibn al-Walid’s covenant with towns near al-Hira, quoted in Arnold, The Preaching of Islam, and in the Dar al-Ifta fatwa above. 

  12. Abu Yusuf, Kitab al-Kharaj: forty-eight dirhams, twenty-four, and twelve, by class of wealth. Comparable tiers are attributed to Umar ibn al-Khattab in Ibn Abi Shayba and al-Bayhaqi. 

  13. The ghiyar regulations enforced by the Abbasid caliph al-Mutawakkil (r. 847–861), requiring distinguishing dress of non-Muslims. Dated here to c. 850 on the standard reference accounts; the Abbasid chronicles have not been consulted directly. [unverified] 

  14. Aurangzeb reimposed the jizya in 1679, reversing Akbar’s abolition in the 1560s. Both dates are taken from standard reference accounts of Mughal India rather than from primary sources. [unverified] 

  15. Mohamed Saleh and Jean Tirole, Taxing Identity: Fiscal Policy and Conversions in Early Islam, Toulouse School of Economics, 5 December 2018 — a theoretical model tested against Egyptian conversion between 641 and 1200. Summarising the earlier empirical result: “because the poll tax… was regressive in income, poorer Copts were more likely to convert to Islam. This led non-convert Copts to shrink into a better-off minority by 1200.” The authors attribute this result to the poll tax’s regressive structure.  2

  16. On conversion eroding the Umayyad tax base in Egypt, Iraq and Khurasan, see Saleh and Tirole as above, which frames the fiscal dilemma directly. The detail that some governors continued collecting from converts is reported in the scholarship surrounding the fiscal rescript of Umar II. [unverified] 

  17. “Muhammad was sent as a prophet and not as a tax collector” — attributed to Umar II and used as the epigraph of Saleh and Tirole, above. The delegation sent by al-Jarrah ibn Abd Allah al-Hakami, governor of Khurasan, complaining that mawali converts raided without pay while still being taxed, is reported in the scholarship on Islamization under Umar II; the primary chronicles have not been consulted directly here. [unverified] 

  18. Dar al-Ifta al-Misriyya, fatwa cited above: non-Muslims who have held full legal citizenship with equal obligations are not subject to jizya.