How to Study REG When You Have Never Filed a US Tax Return

A candidate who grew up in the United States sits REG having filed something like ten tax returns. They have had income tax withheld from a first pay cheque and watched a refund arrive in April. None of that is in the Blueprint, because no US textbook needs to explain it.

A candidate in Riyadh or Dubai has none of it. Saudi Arabia levies no personal income tax, so an employee there has never seen income tax on a payslip, never chosen a filing status and never received a form from an employer that goes to a tax authority. REG then puts 50 to 80% of its marks in federal tax and describes an individual return as if the reader had seen one.

The 66.78% pass rate belongs mostly to people who have. What follows is what they absorbed by living there: the scaffold of a return, the legal culture behind the business law half, why Gulf tax experience transfers least, and a way to build the missing intuition. It is not a study plan; the REG study guide is.

The return REG assumes you have seen

Everything in Area IV, and most of Area V, hangs off one document: the individual return, Form 1040, for one calendar year, prepared on the cash basis. Income counts when received and expenses when paid. The return is due 15 April; an automatic six-month extension moves filing to 15 October, and the extension does not extend the time to pay. Candidates who think of "the deadline" as one date miss the questions built on that gap.

Filing status

Before any number is computed, the taxpayer is sorted into one of five boxes: single, married filing jointly, married filing separately, head of household, or qualifying surviving spouse. Marital status is judged on the last day of the year. The box decides the standard deduction, the bracket thresholds and several phase-outs, which is why a question that seems to be about a deduction is often really about status. Zakat and VAT do not care whether you are married.

The W-2 and the 1099

Income arrives on forms. An employer reports wages and the tax it withheld on a Form W-2; a business that paid an independent contractor reports the payment on a Form 1099-NEC, with nothing withheld. That distinction is the whole difference between an employee and a self-employed person: who pays the payroll tax, whether tax is prepaid through withholding or estimated payments, and which deductions exist. Worker classification sits in Area II because getting it wrong changes everything downstream.

AGI and the line

The return is a sequence, and the most important point on it is adjusted gross income. Items subtracted before it, "above the line", are adjustments: half of self-employment tax, certain retirement contributions, student loan interest. Items subtracted after it, "below the line", are deductions. AGI is the number most limits and phase-outs are measured against, so an above-the-line item is worth more than a below-the-line item of the same size.

Standard or itemised

Below the line, the taxpayer takes the larger of a flat standard deduction or the sum of specific itemised deductions: state and local taxes, mortgage interest, charitable gifts, some medical costs. The flat amount is set each year and depends on filing status. For tax year 2026 the IRS lists it at US$16,100 for single filers, $32,200 for married filing jointly and $24,150 for heads of household; treat those as illustrative, because they move annually and the exam tests the mechanism, not the number.

FICA and self-employment tax

Social Security and Medicare are funded by a payroll tax known as FICA: 6.2% Social Security and 1.45% Medicare from the employee, matched by the employer, with the Social Security portion capped at a wage base (US$184,500 for 2026) and Medicare uncapped. A self-employed person is both employer and employee, so pays the whole 15.3% as self-employment tax on net earnings of US$400 or more, and deducts half of it above the line. GOSI is the nearest Gulf analogue, and a weak one, because it never feeds back into an income tax computation.

Estimated payments

Withholding is why most employees owe little in April. Income with no withholding, from a business, rent, interest or capital gains, has to be prepaid in four instalments, due 15 April, 15 June, 15 September and 15 January of the following year, whenever the expected balance is US$1,000 or more. The safe harbour that avoids a penalty is paying 90% of the current year's tax or 100% of the previous year's, rising to 110% for higher earners.

Federal and state

Everything above is federal. Most states levy their own income tax on top, and a few levy none. REG tests federal law only; state tax appears mainly as something a taxpayer deducts or a corporation adjusts for. When a question says "tax", it means the federal income tax.

An LLC is not a tax classification

The most common business entity in the United States does not exist in the Internal Revenue Code. A limited liability company is a state-law creature; for federal tax it is by default a disregarded entity if it has one owner and a partnership if it has more, and it can elect on Form 8832 to be taxed as a corporation instead. A Gulf reader who maps it onto the Saudi limited liability company, always a separate Zakat or tax payer, has imported an assumption the exam will punish.

The S election

A corporation is taxed on its own income and its shareholders are taxed again on dividends. A corporation that qualifies can instead elect, on Form 2553, to be an S corporation: income passes through to shareholders untaxed at the entity level, in exchange for restrictions. No more than 100 shareholders, only individuals, certain trusts and estates, one class of stock, a domestic corporation, and no non-resident alien shareholders, which closes the structure to most people reading this.

The vocabulary, with and without a Gulf equivalent

The term REG uses	What it actually means	Gulf near-equivalent
Form 1040	The annual individual income tax return	None; there is no personal income tax
Filing status	One of five household categories that sets deductions and brackets	None
W-2	Employer's statement of wages paid and tax withheld	None; a GOSI wage record is the nearest shape
1099-NEC	Payer's statement of fees paid to a contractor, nothing withheld	Loosely a supplier's VAT invoice, but that reports the supply, not the recipient's income
Withholding	The employer prepays the employee's own income tax	Saudi withholding tax, a final tax on payments to non-residents: the opposite direction
Adjusted gross income	Income after above-the-line adjustments; the base for most limits	None
Standard deduction	A flat amount deducted in place of itemised deductions	None
FICA	Social Security and Medicare payroll tax, split between employee and employer	GOSI contributions, without the income tax interaction
Estimated tax	Quarterly prepayments on income that has no withholding	Advance payments to ZATCA, for companies only
Disregarded entity	A single-owner LLC ignored for income tax; the owner reports directly	None
S corporation	A corporation electing pass-through taxation under strict ownership limits	None
Basis	The taxpayer's unrecovered investment in an asset or an entity	Tax written-down value of a fixed asset is a partial match; nothing matches basis in a partnership
Circular 230	Treasury rules for anyone who practises before the IRS	SOCPA's professional conduct rules, for a different regulator and a different tax

The business law half

Area II is 15 to 25% of the paper and it assumes a common-law mind. Contracts come in two systems: common law for services, employment and land, and Article 2 of the Uniform Commercial Code for the sale of goods, which relaxes the common-law rules on offer, acceptance and modification and adds implied warranties. Many contract questions turn on which system governs, and a candidate trained in Saudi or Egyptian commercial law, both codified systems, has no instinct for the split. Agency questions likewise turn on apparent authority, doctrine rather than principle.

Debtor-creditor law brings two more systems. Secured transactions under UCC Article 9 are a sequence, attachment then perfection then priority, that decides who gets the collateral when a borrower fails. Bankruptcy comes in chapters: Chapter 7 liquidation, where a trustee sells the assets and distributes the cash; Chapter 11 reorganisation, where a business keeps operating under a court-approved plan; and Chapter 13 for individuals with regular income, who repay over three to five years. Saudi Arabia's own bankruptcy law looks similar in outline; the exam tests the American priorities and discharge rules, not the outline.

Area I adds the regulation of the preparer. Circular 230 is the Treasury rulebook for anyone who practises before the IRS. The Code backs it with penalties on the preparer personally: for an understatement caused by an unreasonable position, the greater of US$1,000 or half the preparer's fee, rising to the greater of $5,000 or three quarters of the fee for wilful or reckless conduct, plus fixed per-failure amounts for not signing or not furnishing a copy. A preparer answering to the tax authority is itself foreign to a region where the accountant's exposure runs through the client.

Why VAT and Zakat help least here

A Gulf tax professional knows two systems well, and neither is an income tax on a person. VAT is a tax on transactions: the supply is the taxable event and the business collects it. Zakat is a levy on a base built from how a company is funded, which is why a loss-making Saudi company still pays it. Corporate income tax, at 20% on the non-Saudi share of a mixed company, is the one Saudi computation that resembles a US one, and what it resembles is the C corporation, the least novel entity in Area V.

REG is an income tax on a natural person and on the entities that person owns, with the person's circumstances, marital status, dependants and other income deciding the outcome. That framing has no counterpart in a country with no personal income tax, and it inverts the one concept that looks shared: Saudi withholding tax is a final tax the payer deducts from a non-resident, whereas US withholding is the employee's own tax paid in advance and reconciled in April. Candidates from a ZATCA background lose most marks not on rules they never learned but on rules they thought they already knew.

Basis is the anchor

If one idea makes Areas III and V cohere, it is basis. Basis begins as what the taxpayer paid for an asset, rises with improvements, falls with depreciation, and at disposal the gain is the amount realised less the adjusted basis. Depreciation is therefore a temporary deduction: it lowers basis, so it returns as gain on sale, and the recapture rules decide whether that gain is ordinary or capital.

The same quantity runs through every entity. A partner has an outside basis in the partnership interest that rises with contributed cash and allocated income, falls with distributions and losses, and caps the losses the partner can deduct. An S corporation shareholder's stock basis behaves the same way. Learn basis once, as the taxpayer's unrecovered investment wherever it sits, and the entity chapters shrink to variations on a theme. Learn it separately in each chapter and REG is three exams.

Build the intuition: one taxpayer, one year

The fastest way to acquire what US candidates have by osmosis is to file a return mentally, then complicate it. Invent one taxpayer. Call her Dana: single, employed in a state with an income tax. In January a W-2 arrives showing wages and the federal tax withheld, plus a small 1099 for bank interest. Add the two into gross income, subtract her student loan interest to reach AGI, take the standard deduction because her itemised items are smaller, compute the tax from the brackets, subtract the withholding, and note whether April brings a refund or a balance. Do it with round numbers, on paper, until every line has a reason.

Then add a business. In year two Dana consults at weekends and the payments arrive on a 1099-NEC with nothing withheld. Her profit goes on a separate schedule, attracts 15.3% self-employment tax, half of which becomes an above-the-line adjustment, and she now owes quarterly estimated payments because the withholding on her salary no longer covers her. In year three she forms an LLC, which changes nothing federally, then elects S status, which splits her profit into a salary that carries payroll tax and a distribution that does not, and gives her a stock basis to track.

Then sell an asset. The laptop she depreciated is sold above its written-down value, and the depreciation comes back as ordinary income through recapture. A rental property bought with a mortgage, depreciated for years and sold at a profit, produces a long-term capital gain, a recapture component and a basis calculation that includes the loan. Each pass adds one rule, and after three passes you have touched most of Areas III, IV and V with one set of facts you remember. Then switch to simulations, because that is what REG simulations are: one taxpayer, several linked figures, and a wrong basis at step one wrecking everything after it. See CPA Task-Based Simulations: What They Are and How to Practise Them.

Where to practise this

REG rewards learning a foreign system properly and then rehearsing it under a clock. Prepito's REG course covers the full Blueprint with practice questions, timed simulations, full explanations and mistake review, in English, and the TCP course extends the same taxpayer into planning, which is why Dana is worth keeping once REG is passed.

CPA questions and written explanations are in English. Prepito’s interface is available in English and Arabic, and the AI tutor can respond in either language.

For the Blueprint weights and a ten-week plan, see the CPA REG Study Guide: Blueprint, Topics and a Study Plan; for the Discipline that builds on it, the CPA TCP Study Guide: Blueprint, Topics and a Study Plan; and for the whole qualification, the CPA programme.

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Sources: AICPA CPA Exam Blueprints; IRS Publication 501 (filing status), Publication 538 (tax years and the cash method), When to file, Topic 751 and self-employment tax, Form 1040-ES, LLC classification, S corporations, Topic 703 (basis), Circular 230, preparer penalties and the tax year 2026 inflation adjustments; US Courts bankruptcy basics. Deduction amounts, wage bases, thresholds and penalty figures are adjusted every year and the exam tests the mechanism rather than the figure; confirm the tax year that applies to your testing window. The pass rate cited is cumulative for the first two quarters of 2026.