How to Compute Quarterly Income Tax for a Mixed Income Earner Under Graduated Rates: A Worked Example
A mixed income earner who does not elect the 8% option pays two separate kinds of income tax during the year: withholding tax on compensation, handled by the employer, and graduated-rate tax on business or professional income, computed and paid by the individual through BIR Form 1701Q. These two streams run on separate tracks for most of the year and only fully combine when the annual return is filed — a structural detail that trips up mixed income earners who assume their quarterly business-income tax already accounts for their salary.
Compute and File Your Quarterly Return FREE →This post focuses on the default graduated-rate computation for a mixed income earner who has not elected the 8% option. For the mechanics and limits of that election instead, see 8% Income Tax for Mixed Income Earners: Why the ₱250,000 Deduction Doesn’t Apply.
The graduated rate schedule behind the computation #
NIRC Section 24(A), as amended by the TRAIN Law and taking full effect for income earned from 2023 onward, sets the graduated rate brackets both the compensation and business-income portions of a mixed income earner’s total taxable income are measured against:
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.
Why compensation and business income are computed separately during the year #
NIRC Section 24(A) taxes an individual’s total taxable income for the year on a single graduated rate schedule, but during the year itself, a mixed income earner’s compensation is already being taxed through employer withholding computed as if that salary were the person’s only income. Business or professional income earned in the same period doesn’t automatically add to that withholding calculation — instead, the individual separately computes and pays quarterly tax on the business/professional portion using BIR Form 1701Q. Only at annual filing time does the return combine both streams into one total taxable income figure and reconcile what was actually paid across both tracks against what should have been paid on the combined total.
Why there’s no second ₱250,000 exemption #
The ₱250,000 zero-rate bracket at the bottom of the Section 24(A) graduated schedule applies once per individual per year against total taxable income — not once for compensation and again for business income. Because the employer’s compensation withholding calculation already effectively uses that ₱250,000 bracket (treating the salary as if it were the individual’s only income), the business/professional income portion computed on BIR Form 1701Q is taxed on gross business income after allowable deductions, without a second ₱250,000 exemption layered on top. This is the same underlying principle covered in the site’s dedicated post on why the ₱250,000 deduction doesn’t apply twice for mixed income earners choosing the 8% option — it holds under graduated rates too, not just the 8% election.
Worked example: employee with a side consulting practice #
An individual works full-time as an employee earning ₱480,000 in annual compensation, while also running a small consulting practice on the side that generated ₱600,000 in gross receipts for the year, with ₱150,000 in allowable business deductions, and has not elected the 8% option.
Compensation track (handled by the employer):
| Amount | |
|---|---|
| Annual compensation | ₱480,000 |
| Tax withheld by employer (computed on compensation alone) | Based on the BIR withholding tax table |
Business income track (BIR Form 1701Q, quarterly):
| Amount | |
|---|---|
| Gross consulting receipts | ₱600,000 |
| Allowable deductions | ₱150,000 |
| Net taxable business income | ₱450,000 |
| Tax due, computed at graduated rates on this ₱450,000 alone (no separate ₱250,000 exemption applied a second time) | Per the Section 24(A) schedule, quarterly installments |
At annual filing, the individual combines ₱480,000 compensation and ₱450,000 net business income into ₱930,000 total taxable income, computes annual tax due on that combined figure under Section 24(A), and credits whatever was withheld by the employer plus whatever was already paid quarterly on the business income. Because the combined ₱930,000 sits in a higher bracket than either stream alone would suggest, the reconciliation at annual filing often produces additional tax due — the same dynamic that shows up when an employee has two employers in one year, covered in How to File BIR Form 1700.
Filing BIR Form 1701Q as a mixed income earner #
BIR Form 1701Q is filed quarterly for the business or professional income portion only — see How to Compute Quarterly Income Tax for Self-Employed Individuals for the mechanics of the quarterly computation itself, which apply the same way to a mixed income earner’s business income portion. The compensation portion isn’t reported on 1701Q at all; it flows through the employer’s own withholding tax filings and only reappears on the mixed income earner’s own annual return.
Summary #
A mixed income earner under graduated rates runs two separate tax computations for most of the year — employer withholding on compensation, and quarterly BIR Form 1701Q filings on business or professional income — with no second ₱250,000 exemption applied to the business portion. The two streams only combine at annual filing, when total taxable income is computed on the full combined amount, which is often when a mixed income earner discovers additional tax is due because neither track accounted for the other during the year.