Optional Standard Deduction (OSD) Explained — 40% of Gross Receipts (2026)

If you are self-employed, a professional, or running a small business in the Philippines, one of the most useful tools in the tax code is the Optional Standard Deduction, almost always shortened to OSD. It lets you cut out most of the bookkeeping headache by simply deducting 40% of your gross receipts instead of listing every single expense one by one. This guide explains, in plain English, what the OSD is, where it comes from in the law, who can use it, how the math works, and when it genuinely saves you money compared with the alternative.

What Is the Optional Standard Deduction?

The Optional Standard Deduction is a simplified deduction equal to 40% of your gross sales or receipts, plus any other non-operating income you may have earned during the year. It exists as an alternative to itemized deductions — meaning, instead of adding up your rent, salaries, utilities, supplies, depreciation, and all the rest, you can simply take 40% off the top of your gross income and treat that as your deductible expense.

In practical terms, the OSD exists to make life easier for taxpayers whose records are messy, incomplete, or hard to organize, while still giving them a meaningful deduction. If your real expenses happen to be less than 40% of what you earned, the OSD almost always results in a lower tax bill than itemizing. If your real expenses are higher than 40%, itemizing is usually the better choice. We will walk through exactly why later in this article.

Legal Basis: Section 34(L)(1) of the NIRC and the TRAIN Law

The OSD is not an administrative shortcut invented by the Bureau of Internal Revenue (BIR). It is written directly into law, specifically in Section 34(L)(1) of the National Internal Revenue Code (NIRC), as amended by Republic Act No. 10963, better known as the TRAIN Law. Before TRAIN took effect, the OSD was only 10% of gross income, which made it barely worthwhile for most taxpayers. The TRAIN Law raised it dramatically — from 10% to 40% — and the new rate has applied since January 1, 2018.

That single change is one of the reasons the OSD became so popular after 2018. A 10% deduction rarely beat a careful list of actual expenses, but a 40% deduction very often does, especially for service-based professionals and low-overhead businesses where the main cost is the owner's own time and effort. You can confirm the current text and history of this provision on the official Bureau of Internal Revenue website.

Who Can Use the OSD?

The OSD is available to taxpayers who are taxed under the graduated income-tax regime and who file the relevant income tax return. In practice this includes:

• Self-employed individuals, including sole proprietors registered with the BIR as single proprietors.
• Professionals — doctors, lawyers, engineers, accountants, consultants, freelancers, and others practicing a profession for a fee.
• Partnerships and corporations, including One Person Corporations (OPCs), general professional partnerships, and domestic corporations subject to the regular corporate income tax.

For individuals, the election is typically made on BIR Form 1701 (the Annual Income Tax Return for self-employed individuals, professionals, and mixed-income earners). The key point is that the OSD is tied to the way you are taxed, not to your registration type alone. If you have chosen the graduated rates, the OSD is on the table.

OSD Only Applies Under the Graduated Regime, Not the 8% Flat Tax

This is a common point of confusion, so it deserves its own section. Self-employed individuals and professionals in the Philippines generally choose between two tax regimes:

• The 8% flat-tax regime, where tax is simply 8% of gross sales or receipts above ₱250,000, and no deductions of any kind are allowed.
• The graduated income-tax regime, where graduated tax rates apply to your net taxable income, and you may choose either itemized deductions or the OSD.

The OSD only exists inside the graduated regime. You cannot use the 8% flat tax and the OSD together — that combination simply does not exist in the law. Under the 8% option, the gross figure is already the basis, and there is nothing to deduct. So when you see references to the OSD, you should mentally tie them to the graduated rates and the option to itemize.

How the OSD Math Actually Works

Once you have chosen the graduated regime and elected OSD, the calculation follows a clear, predictable pattern. There is no secret formula — it is just the rule from Section 34(L)(1) applied to your numbers:

1. Start with your gross sales, gross receipts, and other non-operating income for the taxable year.
2. Compute 40% of that figure. This 40% is your OSD — your allowed deduction.
3. Subtract the 40% from the gross figure. What remains is 60% of your gross receipts, and this becomes your taxable business income.
4. Apply the graduated income-tax table to that 60% figure to get your income tax due.

In other words, under the OSD your taxable business income is always 60% of your gross receipts. That single shortcut is what makes the method so simple: you never have to total up your expense books, you only need a reliable figure for your gross income. Of course, you should still keep records, because the BIR can always ask to verify your gross receipts, and because you may want to switch to itemized deductions in a future year.

Worked Example: ₱1,000,000 in Gross Receipts

To make this concrete, consider a freelance designer who earned ₱1,000,000 in gross receipts during the taxable year and elected OSD under the graduated regime. Here is how the income tax is computed step by step:

So on ₱1,000,000 of gross receipts, this taxpayer owes ₱62,500 in income tax for the year under the OSD route. Notice how the entire calculation depends only on the gross figure — there is no need to dig into receipts, invoices, or a ledger of expenses. That simplicity is the whole point of the OSD.

OSD vs Itemized Deductions at a Glance

Because the OSD is an either/or choice, the natural question is: how do the two methods compare? The table below summarizes the main differences so you can see them side by side.

When Is the OSD More Beneficial?

The simple rule of thumb is this: the OSD is most beneficial when your actual expenses are less than 40% of your gross receipts. When that is the case, taking the flat 40% gives you a bigger deduction than your real expenses would, which shrinks your taxable income and therefore your tax.

This situation is very common among knowledge workers and service professionals — think software developers, writers, designers, consultants, tutors, and online sellers with low inventory costs. If most of what you "spend" is your own labor, and your hard costs (internet, electricity, a laptop amortized over years, a few subscriptions) come to maybe 15% or 25% of your revenue, the OSD will almost always beat itemizing.

On the other hand, if you run a business with heavy costs — a restaurant paying for food supplies, rent, and many employees, or a trading business with large cost-of-goods-sold — your real expenses can easily exceed 40% of gross. In that case, itemizing usually yields a lower tax, because you can deduct a larger amount than the OSD would give you. The right answer depends entirely on the numbers, which is why it pays to compute both before you file.

Can You Switch Methods From Year to Year?

Yes. The election between OSD and itemized deductions is made annually, on the income tax return for that taxable year, and it is binding for that year only. You cannot claim both methods at the same time, but you are free to choose a different method in a later year if your circumstances change. For example, you might use the OSD during a low-expense year and switch to itemized deductions the following year after you invest heavily in equipment or staff.

This annual flexibility is one of the OSD's quiet advantages. It means you are never permanently locked in, and you can adapt your choice to wherever your numbers happen to land each year. Just remember that once you have filed a given year's return using one method, that choice applies to the whole year — there is no mid-year switching.

Related: Sole Proprietorship vs One Person Corporation

The OSD question is closely tied to how you have structured your business, because your structure partly determines which tax regime and which forms apply to you. A sole proprietorship is not a separate taxable entity — its income flows through to you as an individual, and you file BIR Form 1701, where the OSD election lives. A One Person Corporation (OPC), by contrast, is a separate taxable entity that files its own corporate income tax return; the OSD is still available to a corporation under Section 34(L)(1), but the filing mechanics differ.

If you are deciding which structure fits your situation, or want to understand how tax treatment differs between the two, our dedicated guides go deeper:

• Sole Proprietorship Tax Guide — registration, forms, and the graduated vs 8% choice for individual proprietors.
• One Person Corporation (OPC) Guide — how an OPC is taxed and how the OSD applies at the corporate level.
• You can also browse the full Guides hub for related topics on business and self-employed taxation.

Try the OSD With This Site's Calculator

Reading about the OSD is useful, but seeing the numbers for your own situation is far more powerful. This site's tax calculator applies the 40% OSD automatically whenever you select the "Graduated + OSD" option, so you can instantly see your taxable income and estimated income tax without doing any of the arithmetic by hand. You can also toggle to itemized deductions or the 8% flat tax to compare all three side by side and pick whichever gives you the lowest legally correct result.

Frequently Asked Questions

Key Takeaways

• The OSD is a flat 40% deduction from gross receipts and other income, available under the graduated income-tax regime.
• It comes from Section 34(L)(1) of the NIRC, as raised from 10% to 40% by the TRAIN Law (RA 10963) effective January 1, 2018.
• It is optional and annual — you choose OSD or itemized deductions each year, never both, and you can switch next year.
• It does not apply under the 8% flat-tax regime, which is based on gross income with no deductions.
• Under OSD, taxable business income is always 60% of gross receipts, to which the graduated tax table is then applied.
• The OSD wins when your real expenses are below 40% of gross; itemizing wins when they exceed 40%.