How to Compute Your Income Tax in the Philippines

Staring at your payslip or your sales records and wondering how to compute income tax Philippines 2026 rules actually apply to you? Good news, the math is more straightforward than it looks once you understand the system. The Philippines uses a graduated tax table, which means you only pay higher rates on the portion of income that falls into higher brackets, not your entire income at once.

Who This Applies To

Income tax computation Philippines rules apply to almost everyone earning money here, whether you are a regular employee, a freelancer, a sari-sari store owner, or an online seller. The exact method differs slightly depending on whether you earn purely compensation income or income from self-employment.

If you are self-employed and trying to decide between tax options, our 8% vs graduated tax comparison breaks down which one tends to work better depending on your expenses. Once you have your numbers ready, you can move on to actually filing using our guide on how to file 1701A.

How to Compute Using the Graduated Tax Table

The graduated tax table has been in effect since January 1, 2023 under the TRAIN Law, and the same structure carries into 2026. Here is how to use it, step by step.

1. Start with your gross income for the year, whether from salary, business, or a combination of both.
2. Subtract allowable deductions, such as mandatory SSS, PhilHealth, and Pag-IBIG contributions, plus any business expenses if you are self-employed.
3. The result is your taxable income, the amount the tax table actually applies to.
4. If your taxable income is ₱250,000 or below, you owe ₱0 in income tax, since this entire amount is exempt.
5. If your taxable income falls between ₱250,000 and ₱400,000, you pay 15% of the amount over ₱250,000.
6. If your taxable income falls between ₱400,000 and ₱800,000, you pay ₱22,500 plus 20% of the amount over ₱400,000.
7. If your taxable income falls between ₱800,000 and ₱2,000,000, you pay ₱102,500 plus 25% of the amount over ₱800,000.
8. Higher brackets continue up to 35% for taxable income above ₱8,000,000. Verify the latest deadline with the BIR website or ask BB for the most current information if your income falls into the top brackets, since this is where professional advice often pays off.

8% Flat Tax Computation Example

If you are self-employed or a professional earning ₱3,000,000 or less a year, you may choose the 8% flat tax instead of the graduated table. This 8% flat tax computation example shows how it works.

You compute it as 8% of your gross sales or receipts, after deducting ₱250,000. So if you earned ₱900,000 in gross sales for the year, you subtract ₱250,000, leaving ₱650,000, then apply 8% to get ₱52,000 owed for the year.

This option replaces both the graduated income tax and percentage tax, which makes your quarterly filing simpler. Once you choose it, you generally cannot switch back to graduated rates until the next taxable year.

What Deductions You Can Claim

If you stick with the graduated tax table as a self-employed individual, you can claim either itemized deductions or the Optional Standard Deduction (OSD).

Itemized deductions mean listing actual business expenses like supplies, rent, and utilities tied to your work. The OSD lets you skip that listing and simply deduct 40% of your gross sales or receipts instead, which is simpler but may not always result in lower tax depending on your actual expenses.

Filing Deadlines Table

Verify the latest deadline with the BIR website or ask BB for the most current information, since exact cutoff dates can shift slightly depending on the year.

Form	Who Files It	General Deadline
BIR Form 1700	Employees with purely compensation income, not under substituted filing	April 15 of the following year
BIR Form 1701 / 1701A	Self-employed individuals and mixed-income earners	April 15 of the following year
BIR Form 2551Q	Quarterly Percentage Tax (if not under the 8% option)	Quarterly

How to Pay BIR Using GCash

Once you have your final tax due, you can pay it without lining up at a bank.

1. Open your GCash app and tap “Pay Bills.”
2. Select “Government,” then choose “BIR.”
3. Enter your TIN, RDO code, form type, and the tax period you are settling.
4. Enter the exact computed amount due.
5. Confirm the payment and save your reference number as proof.

You can also pay through the BIR online payment portal if you prefer using your bank app.

Common Mistakes in Income Tax Computation

Most computation errors come from missed steps, not bad math. Watch out for these.

1. Forgetting to subtract mandatory contributions before applying the tax table, which inflates your taxable income.
2. Mixing up gross income with taxable income, when they are not the same number.
3. Choosing the 8% flat tax without checking if your actual expenses would have made the graduated table cheaper.
4. Applying the wrong bracket percentage instead of only applying the higher rate to the portion above the bracket threshold.
5. Switching between 8% and graduated tax mid-year, when the choice locks in for the full taxable year.

Diego’s Story: A Freelance Designer from Cebu

Diego is a freelance graphic designer from Cebu earning ₱850,000 in gross sales for the year, with about ₱150,000 in legitimate business expenses like software subscriptions and a new laptop.

Since his gross sales are below ₱3,000,000, he qualifies for the 8% flat tax option. Using the 8% flat tax computation example formula, he subtracts ₱250,000 from his ₱850,000 gross sales, leaving ₱600,000, then applies 8% to get ₱48,000 owed for the year.

He also ran the numbers under the graduated table with his itemized deductions and found the 8% option came out lower for his situation, so he stuck with it for the year.

Final Thoughts

Learning how to compute income tax Philippines 2026 rules require really comes down to three things. Know your taxable income, know which bracket or rate applies, and double-check whether the 8% option or the graduated table saves you more.

The math gets easier the more you practice it, and small mistakes in computation can lead to bigger headaches later. BB is available 24/7 if you want to run your numbers by someone before you file.

You are already ahead just by taking the time to understand how the system works.

Disclaimer: This guide is for informational purposes only and does not constitute legal or accounting advice. For complex tax situations, consult a licensed CPA.