Side Hustle Tax in Sri Lanka: Salary Plus Side Income
Side Hustle Tax in Sri Lanka: Salary Plus Side Income
You have a job. Your employer takes APIT off your payslip every month and you have never had to think much about it. Then you start taking freelance work on weekends, or you open a small online shop, or you begin consulting for one client on the side. Suddenly nobody is deducting anything, and nobody is telling you what to do.
Side hustle tax in Sri Lanka trips people up for one reason. Most people assume the two incomes are two separate tax problems. They are not. They are one.
Here is what actually happens, with real numbers.
Do I pay tax twice if I have a salary and a side hustle?
No. And this is the part that catches everyone.
Section 3(1) of the Inland Revenue Act says your taxable income is "the total of the person's assessable income for the year from each employment, business, investment and other sources." One total. Not one calculation for the job and a second calculation for the side work.
Section 4 gets you there. It sets your assessable income from each source, and for a resident person it captures income "wherever the source arises." Salary from your employer and profit from your side business each get worked out on their own, then they go into the same pot.
Section 3(2) then takes qualifying payments and reliefs off that combined pot. Once.
This is the single most useful thing to understand about having two income sources. You get one Rs. 1,800,000 personal relief across everything, not one per source. Someone who assumes they get a fresh relief against their side income will badly underestimate what they owe.
So no double tax. But also no double relief, and no fresh start at the bottom slab. Your side income lands on top of your salary and gets taxed at whatever rate you have already climbed to.
That is the real cost, and it surprises people more than the paperwork does.
How is my combined salary and side income tax calculated in Sri Lanka?
Let's use someone specific. Nadeesha earns Rs. 300,000 a month, so Rs. 3,600,000 for the year. She has been doing design work on the side and cleared Rs. 1,200,000 in profit after her expenses.
First, what she would have paid on the salary alone:
| Step | Amount (Rs.) |
|---|---|
| Employment income | 3,600,000 |
| Less personal relief | (1,800,000) |
| Taxable income | 1,800,000 |
| Tax at 6% on first 1,000,000 | 60,000 |
| Tax at 18% on next 500,000 | 90,000 |
| Tax at 24% on next 300,000 | 72,000 |
| Total tax | 222,000 |
Her employer withheld roughly Rs. 222,000 of APIT across the year. Balance owing, nothing.
Now with the side hustle in the picture:
| Step | Amount (Rs.) |
|---|---|
| Employment income | 3,600,000 |
| Business income (net profit) | 1,200,000 |
| Assessable income | 4,800,000 |
| Less personal relief | (1,800,000) |
| Taxable income | 3,000,000 |
| Tax under the First Schedule | 600,000 |
| Less APIT already withheld | (222,000) |
| Balance payable | 378,000 |
The rates come from paragraph 1(1D) of the First Schedule, as enacted by the Inland Revenue (Amendment) Act, No. 2 of 2025:
| Taxable income (Rs.) | Rate |
|---|---|
| Up to 1,000,000 | 6% |
| 1,000,001 to 1,500,000 | 18% |
| 1,500,001 to 2,000,000 | 24% |
| 2,000,001 to 2,500,000 | 30% |
| Above 2,500,000 | 36% |
Look at what that Rs. 1,200,000 of side income actually cost her. Rs. 378,000. That is 31.5% of it, even though her salary alone was only being taxed at 24% at the margin.
The reason is stacking. Her taxable income moved from Rs. 1,800,000 to Rs. 3,000,000, and that Rs. 1,200,000 climbed through three bands on the way:
- Rs. 200,000 at 24% = Rs. 48,000
- Rs. 500,000 at 30% = Rs. 150,000
- Rs. 500,000 at 36% = Rs. 180,000
Set aside roughly a third of every rupee your side hustle earns, not 6%. If your salary has already pushed you past Rs. 2,500,000 of taxable income, set aside 36%. The bottom slabs are gone, spent on your salary.
What happens to the APIT my employer already deducted?
It counts. Every rupee.
Section 83A(3) says the Act's withholding tax provisions apply to APIT with the necessary changes. That routes you to Section 89, which is the provision that matters here:
"89. (1) The withholdee of a payment that is not a final withholding payment shall be treated as having paid any tax: (a) withheld from the payment under this Division ... (2) A withholdee shall be entitled to a tax credit in an amount equal to the tax treated as paid under subsection (1) for the year of assessment in which the payment is derived."
You are treated as having already paid it, and you get a credit for the same amount. In Nadeesha's case that credit is the Rs. 222,000 line in the table above. It is not lost, and it is not some separate tax that sits outside the calculation.
If the credit ends up larger than your final bill, Section 150 makes the excess refundable. There is a fast lane too. Section 150(2A)(a) requires the Commissioner-General to pay refunds of Rs. 180,000 or less to a resident individual within three months of the claim, before any audit, for years of assessment starting on or after April 1, 2025. Our guide on how to claim a tax refund in Sri Lanka covers the mechanics.
If APIT itself is new to you, start with the beginner's guide to APIT for Sri Lankan employees.
Why does side income mean I suddenly owe quarterly instalments?
Because Section 90(1) draws the line at income type, not at income size.
"90. (1) A person who is an 'instalment payer' shall pay tax by quarterly instalments if he derives or expects to derive assessable income during a year of assessment (a) from a business, investment or other income; or (b) from an employment where the employer is not required to withhold tax under section 83 or section 83A."
Read paragraph (a) again. Business income. That's it. There is no threshold to cross and no minimum profit. The moment your side hustle produces business income, you are an instalment payer.
Salary alone never triggered this, and the IRD has said so directly. Circular No. SEC/2026/E/06 (Re-Revised), dated August 12, 2026, puts it plainly under its "Employment Income Exemptions (APIT/AIT)" heading, at sub-paragraph (i):
"Therefore, if an individual derives income solely from the employment and that income is subject to APIT, there is no requirement to make quarterly instalment payments, and the credit schedule mentioned above is also not required."
That word "solely" is doing all the work. Your side hustle removes it.
The dates come from Section 90(2): August 15, November 15 and February 15 inside the year of assessment, then May 15 of the following year. For 2026/2027 that's August 15 2026, November 15 2026, February 15 2027 and May 15 2027. Because they sit in the Act rather than in a circular, the IRD cannot move them, which is worth knowing given how many times the 2026/2027 circular was revised.
How much is each quarterly instalment?
Section 90(3) gives a formula: (A − C) / B.
The Inland Revenue (Amendment) Act, No. 11 of 2026 rewrote two of those three letters for years of assessment starting on or after April 1, 2026.
A is no longer an estimate you produce. It is now "the amount of tax payable by the instalment payer with respect to the taxable income under paragraph (a) of subsection (1) of section 2 in the immediately preceding year of assessment." Last year's tax, in other words. There is a proviso for anyone who had no taxable income last year or expects lower income this year, and those taxpayers estimate instead, using a procedure the Commissioner-General specifies.
B is the number of instalments left in the year, including the one you are calculating.
C is the sum of what you have already put in. That includes earlier instalments, and, thanks to a new paragraph (ba) inserted by the 2026 amendment, "tax withheld or to be withheld during the relevant year of assessment under Division II."
Notice the phrase "or to be withheld" in item C. Your full year of APIT counts against the instalment base, including the months that have not happened yet. The circular says the same thing, allowing APIT "deducted or expected to be deducted by the employer for the year of assessment" to be subtracted before the formula is applied.
Back to Nadeesha. Say her 2025/2026 tax came to Rs. 600,000, and her salary is steady so she expects Rs. 222,000 of APIT again this year.
Her first instalment, due August 15:
(600,000 − 222,000) / 4 = Rs. 94,500
By November 15, C has grown to Rs. 316,500 (the Rs. 222,000 of APIT plus the Rs. 94,500 she paid in August) and B has dropped to 3:
(600,000 − 316,500) / 3 = Rs. 94,500
It holds at Rs. 94,500 for all four quarters. Add them up and you get Rs. 378,000, which is precisely the tax on her side income and nothing else. The formula quietly hands the salary portion to APIT and asks you to fund only the rest.
That is the whole design, and it is genuinely elegant once you see it. The full guide to quarterly tax payments walks through more scenarios.
Your first year with a side hustle is the dangerous one. If last year was salary only, A is small and your expected APIT is roughly the same size, so (A − C) / B computes to zero or close to it. You pay no instalments, feel fine, then the entire tax on a year of side income falls due as a single lump sum on September 30. Miss it and Section 179(2) adds 10% after fourteen days, with 1.5% per month or part month of interest under Section 159(1) running on top.
If your instalments compute to zero in year one, pay something voluntarily anyway. Putting aside a quarter of the eventual balance on each instalment date turns a painful September lump sum into four manageable payments.
What if my side hustle is actually a second job?
Then almost none of the above applies, and you need a different article.
Section 90(1)(b) only pulls employment into the instalment net when the employer is not required to withhold. If your second income comes from a second employer who does deduct APIT, you are not an instalment payer on account of that income. You are in the primary and secondary employment regime instead, where one employer applies your relief and the other withholds from the first rupee.
That is a genuinely different set of rules, and we have covered it in primary vs secondary employment tax in Sri Lanka.
The test is not whether the work feels like a job. It is whether the person paying you is operating APIT on it. A retainer from a company that treats you as a contractor is business income. A part-time contract of employment is employment income.
What can I deduct against my side hustle income?
This is where the side hustle actually gets better treatment than the salary.
Section 10(1)(a) is blunt about employment: "No deduction shall be made in calculating a person's income from employment." Your commute, your laptop, your clothes, none of it comes off your salary.
Business income is different. Section 11(1) allows expenses "to the extent they are incurred during the year by the person and in the production of income from the business." Section 11(2) rules out anything of a capital nature, which Section 11(3) defines as securing a benefit capable of lasting longer than twelve months.
Those four words, "to the extent they," are the apportionment rule. If you run the side hustle from a room at home, you split the electricity bill and claim the business share. If you use one phone for both, you split that too. The IRD's own guidance works exactly this way for a home office.
Watch out for Section 197, which defines domestic expenditure and puts it firmly out of reach. Maintaining yourself, commuting from home, clothing that is suitable for wearing outside work, and personal debts are all blocked.
Our guide on what expenses freelancers can deduct in Sri Lanka goes through the categories in detail, and keeping tax records properly matters more than most people expect once you are apportioning anything.
Do I have to file a tax return now, and when do I pay?
Yes, you almost certainly do now.
Section 94(1)(c) excuses an individual whose tax payable "relates exclusively to income from employment where the employer has deducted Advance Personal Income Tax under section 83A." That was you before the side hustle. It is not you anymore, because your tax no longer relates exclusively to employment.
Two dates, and people mix them up constantly:
| What | When | Source |
|---|---|---|
| Balance of tax payable | September 30, 2027 | s.82(2)(c)(ii), six months after year end |
| Return of Income filed | November 30, 2027 | s.93(1), eight months after year end |
The money is due two months before the paperwork. If you plan around the November date and forget September, interest starts running under Section 157(1) while you are still gathering documents.
The short version
One salary and one side hustle is one tax problem, not two. Everything aggregates under Section 3, one personal relief comes off, one set of slabs applies, and the APIT your employer already withheld comes off the end as a credit under Section 89.
What genuinely changes is the timing. Business income makes you an instalment payer under Section 90(1)(a), and four dates enter your calendar that were never there when you only had a salary. The tax was always going to be owed. The side hustle just moved when you have to hand it over.
If your side income has grown enough that you are wondering whether to leave the job entirely, the numbers shift again, and we have mapped that transition in going from employee to freelancer in Sri Lanka.
Frequently asked questions
Quick answers to common questions on this topic.
Do I need to tell my employer about my side hustle?
Not for tax purposes. Your employer calculates APIT on the employment income they pay you and nothing else. Your side income goes on your own Return of Income, and any quarterly instalments are your obligation rather than theirs. Check your employment contract separately though, because some contracts restrict outside work for reasons that have nothing to do with tax.
How much tax will I actually pay on my side income?
It depends on where your salary has already put you. Side income stacks on top of employment income in one combined taxable income, so it gets taxed at your upper rates instead of starting again at 6%. Someone already inside the 24% band can expect their side income to be taxed at 24%, then 30%, then 36% as it climbs through the remaining slabs.
When are the quarterly instalment dates in Sri Lanka?
Section 90(2) sets four dates: August 15, November 15 and February 15 within the year of assessment, then May 15 of the following year. For the Year of Assessment 2026/2027 that means August 15 2026, November 15 2026, February 15 2027 and May 15 2027. These dates sit in the Act, so an IRD circular cannot move them.
What happens if I miss a quarterly instalment?
Section 179(2) applies a penalty of 10% of the unpaid amount if you are still short fourteen days after the due date. On top of that, Section 157 charges late payment interest at the rate set in Section 159(1), which is 1.5% per month or part of a month. Interest is calculated separately and comes in addition to the penalty.
Can I deduct expenses against my side hustle income?
Against the business income, yes. Section 11(1) allows expenses to the extent they are incurred in producing that income, and Section 11(2) excludes anything of a capital nature. Where something is used partly for the business and partly personally, you apportion it and claim only the business share. You cannot deduct anything against your salary, because Section 10(1)(a) blocks it outright.
When do I pay the balance and when do I file the return?
Those are two different dates. Under Section 82(2)(c)(ii) the balance of tax is payable six months after the year of assessment ends, so September 30, 2027 for the 2026/2027 year. The Return of Income itself is due eight months after year end under Section 93(1), which is November 30, 2027. The money is due before the paperwork.
What if my APIT was more than my total tax bill?
You claim it back. Section 89 treats withheld APIT as tax you have already paid, and Section 150 makes any excess refundable. For a resident individual claiming Rs. 180,000 or less for a year of assessment starting on or after April 1, 2025, Section 150(2A)(a) requires the Commissioner-General to pay that refund within three months, before any audit.
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