Compare itemized deductions with the 40% OSD.
Recommended method
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Tax under OSD
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Tax itemized
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A deduction you can claim without a single receipt
Every self-employed professional in the Philippines who uses graduated rates has to reduce gross income to taxable income somehow, and there are two legal ways to do it. You can itemize, tallying actual deductible expenses with documents to back each one, or you can take the Optional Standard Deduction, a flat 40 percent of gross sales or receipts that the Bureau of Internal Revenue (BIR) lets you claim with no proof of spending at all. The remaining 60 percent is what gets taxed at graduated rates. This calculator runs both deductions through the same graduated brackets and flags the one that produces the smaller bill.
The comparison is really a contest between two deduction sizes. Whichever deduction is larger leaves less taxable income behind, and so produces less tax. That is the lens to read the result through, and it makes the decision rule refreshingly simple.
The 40 percent line that decides everything
The OSD wins whenever your real deductible expenses come in below 40 percent of gross, because then the flat 40 percent deduction is bigger than what you could itemize. Itemizing wins when your genuine costs run above 40 percent of gross. That single threshold, the 40 percent rate this calculator applies, is the pivot. Confirm the current OSD rate and the rules on what counts as itemizable with the BIR, since the deduction regime is set by statute and can be amended. A service professional with light overheads, a consultant, a coach, a designer working from a laptop, almost always lands below the line and benefits from OSD.
PHP 1.8 million in receipts, both deductions tested
Take the tool's default of PHP 1,800,000 in gross receipts with PHP 500,000 of itemized expenses. The OSD deduction is 40 percent of PHP 1,800,000, which is PHP 720,000, comfortably larger than the PHP 500,000 you could itemize. Under OSD, taxable income is PHP 1,080,000 and the graduated tax, using the rates this calculator applies, is PHP 172,500. Itemizing leaves taxable income of PHP 1,300,000 and tax of PHP 227,500. The OSD saves PHP 55,000, and the reason is plain: its deduction is PHP 220,000 bigger than your real expenses.
| Item | 40 percent OSD | Itemized |
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The chart contrasts the tax under each method so you can see the saving at a glance.
When itemizing earns its paperwork
Flip the example and the answer flips with it. Raise the expense field above PHP 720,000 and itemizing becomes the cheaper route, because your real costs now exceed the flat 40 percent. Capital-heavy work tends to land here: a printing business, a clinic with equipment and consumables, a logistics operation with fuel and vehicle costs. The catch is that itemizing demands disciplined records. You need official receipts, you need them to qualify as deductible under BIR rules, and you need them to survive an audit. OSD trades a slightly larger tax bill in exchange for none of that burden, which is why many small professionals pick it even when itemizing would shave a little more.
One rule that surprises newcomers: you commit to a method in your first-quarter return for the year, and you cannot switch to the other partway through. Run your projected full-year gross and a realistic expense estimate through this tool before that first filing, because changing your mind in the third quarter is not an option the law gives you.
Is OSD the same as the 8 percent flat tax?
No, and conflating them is a frequent error. The 8 percent flat tax replaces both income tax and percentage tax with a single charge on gross. OSD is not a separate tax at all; it is just a way of computing your deduction while you remain on the ordinary graduated income tax. You still pay graduated rates on the 60 percent that is left, and you still handle percentage tax or VAT separately. This tool compares OSD against itemized deductions within the graduated system, not against the 8 percent option.
Do I need any receipts at all if I choose OSD?
You do not need receipts to justify the 40 percent deduction itself, which is the appeal. You should still keep records of your gross sales or receipts, because the deduction is computed from that figure and the BIR can verify it. So OSD lightens the load on the expense side but does not excuse you from documenting income. Keep your sales records clean even when you skip the expense paperwork.