Step-by-step calculation
This walk-through assumes a Myanmar tax resident on a fixed monthly salary plus a contractual or customary 13th-month payment (paid before Thingyan or before year-end, depending on the employer's policy). Default: single, no dependant allowances, no donations. Brackets are from the Union Tax Law 2025-2026 (Section 5). The 13th-month salary has no special tax status — it is part of assessable salary income in the year of payment. Tax year: 1 April – 31 March.
Step 1 — Apply the 20% basic personal relief
Add the 13th-month payment to the projected annual base salary and apply the 20% basic personal relief (capped MMK 10,000,000) to the combined figure once. The relief is annual and indivisible; it cannot be claimed separately on the 13th-month line.
| Projected annual base (12 × monthly) | (figure) |
| Plus: 13th-month payment | (figure) |
| = Annual gross | (sum) |
| Less: 20% basic personal relief | − up to MMK 10,000,000 |
| Less: spouse / child / parent allowances | 0 in default case |
| Annual taxable income | = residual |
Step 2 — Apply the Union Tax Law 2025-2026 brackets
| Annual taxable income | Marginal rate |
|---|---|
| 1L – 20L (MMK 0 – 2,000,000) | 0% |
| 20L – 100L (MMK 2,000,000 – 10,000,000) | 5% |
| 100L – 300L (MMK 10,000,000 – 30,000,000) | 10% |
| 300L – 500L (MMK 30,000,000 – 50,000,000) | 15% |
| 500L – 700L (MMK 50,000,000 – 70,000,000) | 20% |
| 700L & above (MMK 70,000,000+) | 25% |
Worked illustration — base MMK 800,000/month (annual MMK 9,600,000) + 13th-month MMK 800,000 = MMK 10,400,000 annual gross (taxable = MMK 8,400,000 after 20% relief, which is below the MMK 10M cap):
| Band | Amount in band (MMK) | Rate | Tax (MMK) |
|---|---|---|---|
| First 2,000,000 | 2,000,000 | 0% | 0 |
| 2,000,001 – 8,400,000 | 6,400,000 | 5% | 320,000 |
| Annual PIT (with 13th-month) | MMK 320,000 | ||
Without the 13th-month, annual PIT would be MMK 280,000. The marginal cost of the MMK 800,000 13th-month payment is MMK 40,000 — the full amount falls in the 5% band.
Step 3 — Convert to monthly withholding
- Smoothed: MMK 320,000 ÷ 12 ≈ MMK 26,667/month from April.
- One-off in the 13th-month payment month: MMK 280,000 ÷ 12 ≈ MMK 23,333/month for ordinary months, plus a one-off PIT of MMK 40,000 in the payment month.
- Annual reconciliation: both methods must tie to MMK 320,000 by 30 June.
What about SSB and the true net salary?
If the base monthly wage already exceeds the MMK 300,000 SSB cap, the 13th-month payment does not add to SSB — the employee 2% is already at MMK 6,000/month. If base is below the cap, the bonus month can push SSB temporarily to the cap.
| 13th-month month gross | MMK 800,000 base + MMK 800,000 = MMK 1,600,000 |
| Less: PIT (one-off) | − MMK 23,333 base + MMK 40,000 = MMK 63,333 |
| Less: SSB (employee, 2% on cap) | − MMK 6,000 |
| Bonus-month take-home | ≈ MMK 1,530,667 |
Employer takeaway
Treat the 13th-month salary as ordinary assessable income in the year paid. Add it to projected annual gross at the start of the year (or recompute when announced), apply the 20% relief to the combined total, and withhold PAYE either smoothed monthly or one-off in the payment month. Remit to IRD by the 15th of the following month, file the annual reconciliation by 30 June, and retain payroll calculations for at least 7 years.
Common variations to watch for
- 13th-month paid in two halves (mid-year + year-end) — each portion is assessable when paid; both end up in the same tax year if within 1 April – 31 March.
- 13th-month for new joiners — many employers prorate by months of service; tax the prorated amount as paid.
- 13th-month paid in goods or vouchers — the market value is assessable salary.
- 13th-month plus a separate performance bonus — both assessable. See bonus tax treatment.
- 13th-month deferred across tax years — assessable in the year actually paid, regardless of accrual.
Common PIT mistakes to avoid
- Treating 13th-month as exempt — there is no exemption under the Myanmar Income Tax Law.
- Forgetting the 20% relief is annual — do not apply a fresh 20% to the 13th-month line.
- Withholding nothing in the 13th-month month — the marginal tax is real cash; either smooth or withhold one-off.
- Missing the 15th remit deadline — late PIT triggers interest. See penalties.
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