Freelance Quarterly Taxes: A Simple System That Actually Works
Freelancers who wait until year-end to think about taxes are almost always in for an unpleasant surprise. A simple quarterly system fixes this — and takes less than 30 minutes to set up.
Why "I'll deal with it later" fails
Income tax on freelance earnings isn't withheld automatically the way it is from a paycheck. Without a system, the full tax bill lands at once, often after the money has already been spent on business growth or living expenses. The fix isn't complicated — it's setting aside a percentage every single time you get paid.
The 3-step quarterly system
- Set aside a fixed % on every payment. A simple starting point is 20-30% of gross income, moved to a separate savings account the same day you're paid — not at month-end.
- Review your running total every quarter. Every 3 months, total up income and expenses so far. This catches both under-saving (if income jumped) and over-saving (if a slow quarter means less tax is owed).
- Reconcile at year-end, don't calculate from scratch. Because you've already been tracking quarterly, year-end filing becomes a 20-minute reconciliation instead of a stressful scramble through a year of invoices.
Worked example
| Quarter | Income | Set aside (25%) | Running total saved |
|---|---|---|---|
| Q1 | $6,000 | $1,500 | $1,500 |
| Q2 | $4,000 | $1,000 | $2,500 |
| Q3 | $8,000 | $2,000 | $4,500 |
| Q4 | $6,000 | $1,500 | $6,000 |
By year-end, this freelancer has $6,000 already set aside against a $24,000 income year — no scrambling, no missed payments, and a clear number to reconcile against whatever the actual filed tax turns out to be.
What to track alongside income
- Every invoice issued and payment received, with dates
- Business expenses that reduce taxable income (software, equipment, a portion of home office costs)
- Any tax already withheld at source by clients, so it's credited correctly rather than double-counted
Curious what a Thai freelancer's tax looks like?
Try the free ภ.ง.ด.90 tax estimator