How to Compute Quarterly Income Tax for Self-Employed Individuals: A Worked Example
BIR Form 1701Q is not computed quarter by quarter in isolation — it’s cumulative, meaning each quarter’s tax is based on year-to-date income run through the graduated rate table, minus tax already paid in prior quarters and any creditable withholding tax received. This worked example walks through a self-employed professional’s Q1 through Q3 filings under the graduated rates (not the 8% option, which this site covers separately) to show exactly how the running total works.
Generate the BIR Form 2307 Behind Your Withholding Credit FREE →The graduated rate table #
Since 2023, individual taxpayers under the graduated system use the rate table set by the TRAIN Law (Republic Act No. 10963), unchanged by the later CREATE MORE Act (Republic Act No. 12066), which focused on corporate rather than individual tax rates:
| Taxable income | Tax due |
|---|---|
| Not over ₱250,000 | 0% |
| Over ₱250,000 but not over ₱400,000 | 15% of the excess over ₱250,000 |
| Over ₱400,000 but not over ₱800,000 | ₱22,500 + 20% of the excess over ₱400,000 |
| Over ₱800,000 but not over ₱2,000,000 | ₱102,500 + 25% of the excess over ₱800,000 |
| Over ₱2,000,000 but not over ₱8,000,000 | ₱402,500 + 30% of the excess over ₱2,000,000 |
| Over ₱8,000,000 | ₱2,202,500 + 35% of the excess over ₱8,000,000 |
Meet the taxpayer #
A freelance consultant elects the graduated rates with the 40% Optional Standard Deduction (OSD) instead of itemized deductions, and earns unevenly across the year, with a mix of clients who withhold tax and a few who don’t. See How to Elect the Optional Standard Deduction if OSD versus itemized deductions itself needs a refresher — this example assumes OSD is already elected for the year and holds that election constant across all three quarters, since the choice locks in for the year once made.
Q1: first-quarter computation #
| Item | Amount |
|---|---|
| Q1 gross receipts | ₱600,000 |
| Less: 40% OSD | (₱240,000) |
| Q1 taxable income | ₱360,000 |
| Tax due (₱250,000–₱400,000 bracket: 15% of excess over ₱250,000) | ₱16,500 |
| Less: BIR Form 2307 credits received in Q1 | (₱6,000) |
| Q1 tax payable | ₱10,500 |
The consultant files and pays this by the Q1 deadline, May 15.
Q2: cumulative computation kicks in #
Q2 doesn’t start a fresh calculation — it recomputes tax on the full year-to-date income, then subtracts what was already paid in Q1. Suppose Q2 gross receipts are ₱900,000, bringing cumulative receipts for the first half of the year to ₱1,500,000:
| Item | Amount |
|---|---|
| Cumulative Q1+Q2 gross receipts | ₱1,500,000 |
| Less: 40% OSD | (₱600,000) |
| Cumulative taxable income | ₱900,000 |
| Cumulative tax due (₱800,000–₱2,000,000 bracket: ₱102,500 + 25% of excess over ₱800,000) | ₱127,500 |
| Less: cumulative BIR Form 2307 credits (Q1+Q2) | (₱21,000) |
| Less: Q1 tax already paid | (₱10,500) |
| Q2 tax payable | ₱96,000 |
This is due by the Q2 deadline, August 15. Notice the ₱127,500 figure is the tax on the full ₱900,000 cumulative taxable income — not a separate Q2-only bracket calculation — which is what “cumulative” means in practice on BIR Form 1701Q.
Q3: the pattern repeats #
Q3 follows the identical structure: recompute cumulative tax on nine months of income, then subtract everything already credited or paid in Q1 and Q2. If Q3 gross receipts add ₱700,000, cumulative receipts for the year reach ₱2,200,000:
| Item | Amount |
|---|---|
| Cumulative Q1–Q3 gross receipts | ₱2,200,000 |
| Less: 40% OSD | (₱880,000) |
| Cumulative taxable income | ₱1,320,000 |
| Cumulative tax due (same ₱800,000–₱2,000,000 bracket) | ₱232,500 |
| Less: cumulative BIR Form 2307 credits (Q1–Q3) | (₱33,000) |
| Less: Q1+Q2 tax already paid | (₱106,500) |
| Q3 tax payable | ₱93,000 |
Due by the Q3 deadline, November 15. A fourth-quarter true-up then happens on the annual return, BIR Form 1701A or BIR Form 1701, due the following April 15 — there’s no separate Q4 quarterly return under the current system.
Why the BIR Form 2307 credit matters at every step #
Every BIR Form 2307 the consultant receives from a client who withholds tax reduces the cash tax payable for that quarter, regardless of when in the quarter it was received — which is why keeping certificates organized matters as much as computing the bracket correctly. A missing or misplaced Form 2307 doesn’t just create paperwork friction; it means overpaying tax that was already withheld and remitted to the BIR on the taxpayer’s behalf, since the credit only reduces the amount payable if it’s actually claimed on the return. See How to Claim Creditable Withholding Tax Credit Using BIR Form 2307 for the claiming mechanics in more detail.
Deadlines at a glance #
| Quarter | Deadline |
|---|---|
| Q1 | May 15 |
| Q2 | August 15 |
| Q3 | November 15 |
| Annual (Q4 true-up) | April 15 of the following year |
The EOPT Act (Republic Act No. 11976), effective January 22, 2024, reduced the late-filing surcharge for eligible micro and small taxpayers and allowed filing and payment at any RDO, Authorized Agent Bank, or accredited software provider regardless of registered address — but it did not move these specific 1701Q or annual 1701 deadlines.
Summary #
BIR Form 1701Q’s cumulative method means each quarter’s tax is computed on total year-to-date income, not that quarter’s income alone, with prior quarters’ payments and all BIR Form 2307 credits received subtracted to arrive at what’s actually due. Missing a quarter’s credits or miscounting cumulative income is the most common way this computation goes wrong. For the procedural side of filing — not just the math — see How to File BIR Form 1701Q, and for the alternative flat-rate system, see the site’s 8% income tax rate coverage.