📋 Quick Answer
A reverse tax calculator works backward from a known tax amount to estimate the gross income that generated it. For Tax Year 2026-27, the tool uses Finance Act 2026 salary slabs under Section 149 — ranging from 1% to 35% above the PKR 600,000 tax-free threshold. Enter any annual or monthly tax figure above, and the calculator returns the estimated gross income, effective rate, and applicable slab instantly.
Many people in Pakistan know the tax deducted from their salary — it appears on every payslip — but cannot immediately answer what total income that tax represents. A reverse income tax calculator Pakistan 2026-27 answers exactly that question. By applying the latest FBR Finance Act 2026 slabs in reverse, anyone can calculate income by tax in seconds — whether to verify an employer’s deduction, cross-check a salary offer, or reconstruct an income record. This page uses the confirmed TY2026-27 rates effective July 1, 2026.
What Does "Calculate Income by Tax" Mean?
To calculate income by tax means determining the approximate gross income when the tax amount is already known. It is the inverse of the standard income tax calculation — instead of starting with income to find tax, the process starts with tax to find income.
The FBR progressive tax system under the Income Tax Ordinance 2001 means each rupee of tax maps to a specific income range. The reverse formula locates which slab the known tax falls into, subtracts the fixed component, divides the remainder by the marginal rate, and adds the slab's lower income threshold to arrive at the gross income estimate.
📋 Verify Employer Deductions
Salaried employees can check whether the tax their employer deducts under Section 149 matches their actual income bracket.
💾 Reconstruct Missing Records
When income slips are unavailable but the tax payment receipt or payslip deduction figure is known, the reverse calculation reconstructs the gross income.
📈 Evaluate a Job Offer
HR teams and candidates can cross-check a quoted "tax-inclusive" salary figure to confirm the gross CTC behind a stated monthly tax deduction.
👔 Tax Consultant Audits
Tax advisors and accountants use reverse calculations to cross-check client returns and verify that declared income aligns with the tax paid on record.
How Reverse Tax Calculation Works — The Formula
Pakistan's progressive tax system applies different rates to different income slabs. The reverse formula uses exactly the same structure, applied in the opposite direction. For salaried income under Section 149, Finance Act 2026:
Reverse Tax Formula — TY2026-27
Gross Income = Lower Limit + ( (Tax Paid − Fixed Tax) ÷ Rate )
Where: Lower Limit = slab floor · Fixed Tax = fixed component of that slab · Rate = marginal rate as a decimal
The four-step process to apply it manually:
Locate the Correct Slab
Compare the known annual tax against the slab table below. Identify which slab's fixed tax is less than or equal to the known tax amount.
Subtract Fixed Tax
Deduct the slab's fixed tax component from the total tax paid. The remainder is the tax attributable to the marginal rate portion of income.
Divide by the Rate
Divide the remaining tax by the slab's marginal rate (as a decimal). This gives the excess income above the slab's lower bound.
Add the Slab Floor
Add the slab's lower income limit to the figure from Step 3. The total is the estimated gross annual income.
FBR Salary Tax Slabs 2026-27 — Reverse Reference Table
The table below is the Finance Act 2026 slab structure used by this reverse tax calculator. Each row shows the fixed tax and marginal rate required for the reverse formula. Rates apply to salaried individuals under Section 149, effective July 1, 2026.
| Annual Income Slab (PKR) | Rate | Fixed Tax (PKR) | Slab Floor (PKR) |
|---|---|---|---|
| Up to 600,000 | 0% — Exempt | — | — |
| 600,001 – 1,200,000 | 1% | 0 | 600,000 |
| 1,200,001 – 2,200,000 | 11% | 6,000 | 1,200,000 |
| 2,200,001 – 3,200,000 | 20% | 116,000 | 2,200,000 |
| 3,200,001 – 4,100,000 | 25% | 316,000 | 3,200,000 |
| 4,100,001 – 5,600,000 | 29% | 541,000 | 4,100,000 |
| 5,600,001 – 7,000,000 | 32% | 976,000 | 5,600,000 |
| Above 7,000,000 | 35% | 1,424,000 | 7,000,000 |
ⓘ For business or non-salaried income (Section 153), different slabs apply. Use the Business Income Tax Calculator for that scenario.
Worked Examples — Income from Tax (TY2026-27)
The examples below apply the Finance Act 2026 reverse formula to common tax amounts. These replace the previous TY2025-26 examples throughout this article.
| Annual Tax Paid (PKR) | Slab Identified | Estimated Gross Income (PKR) | Monthly Income (PKR) |
|---|---|---|---|
| 0 | Exempt — 0% | ≤ 600,000 | ≤ 50,000 |
| 3,000 | 1% (PKR 600K–1.2M) | 900,000 | 75,000 |
| 6,000 | 1% (top of slab 2) | 1,200,000 | 100,000 |
| 72,000 | 11% (PKR 1.2M–2.2M) | 1,781,818 | ~148,485 |
| 116,000 | 20% (PKR 2.2M–3.2M) | 2,200,000 | ~183,333 |
| 316,000 | 25% (PKR 3.2M–4.1M) | 3,200,000 | ~266,667 |
| 541,000 | 29% (PKR 4.1M–5.6M) | 4,100,000 | ~341,667 |
| 976,000 | 32% (PKR 5.6M–7M) | 5,600,000 | ~466,667 |
ⓘ Estimates are for salaried individuals (Section 149) with no additional deductions applied. Use the reverse calculator above for exact results including monthly tax figures.
Step-by-Step Example — Finding Gross Income from PKR 72,000 Annual Tax
This walkthrough demonstrates the reverse formula using a real figure from the TY2026-27 slabs.
Known annual tax paid: PKR 72,000
Step 1 — Locate the slab:
PKR 72,000 is greater than the fixed tax of PKR 6,000 (slab 3 floor) and less than PKR 116,000 (slab 4 floor). It belongs to the PKR 1,200,001 – 2,200,000 slab at 11%.
Step 2 — Subtract fixed tax:
72,000 − 6,000 = 66,000 (marginal tax portion)
Step 3 — Divide by rate:
66,000 ÷ 0.11 = 600,000 (excess income above slab floor)
Step 4 — Add slab floor:
1,200,000 + 600,000 = PKR 1,800,000 annual gross income
✅ Result: A person paying PKR 72,000 in annual salary tax (TY2026-27) has an estimated gross income of PKR 1,800,000/year — or PKR 150,000/month.
Note how this differs from the TY2025-26 result for the same tax amount. Under the old 15% rate, PKR 72,000 in tax corresponded to roughly PKR 1,480,000 in income. Under Finance Act 2026's 11% rate, the same PKR 72,000 maps to a higher income of PKR 1,800,000 — reflecting the tax relief introduced by the budget.
Common Scenarios Where the Reverse Tax Calculator Helps
| Who Uses It | Scenario | What the Reverse Calculator Provides |
|---|---|---|
| Salaried Employee | Monthly tax on payslip seems high | Confirms what annual salary the deducted tax implies — enables employer verification |
| Job Applicant | Offer letter shows "tax deduction: PKR 13,000/month" | Reveals implied gross annual salary (≈ PKR 2,400,000) before accepting the offer |
| HR & Payroll | Verifying payroll system after Finance Act 2026 update | Cross-checks that new 1%/11% rates are correctly applied vs previous 5%/15% rates |
| Local Freelancer | Tax deducted by local agency — income slip unavailable | Estimates gross PKR earnings from known withholding tax amount for record-keeping |
| Tax Consultant | Auditing client return — only tax certificate available | Quickly reconstructs income range to flag discrepancies before filing |
| Government Employee | BPS pay scale change mid-year — need income estimate | Calculates which income slab applies after the provincial salary increase notification |
For questions related to provincial salary increases and their tax implications, see the Punjab Salary Increase 2026-27 guide.
What Changed in TY2026-27 That Affects Reverse Calculations?
Anyone using reverse tax calculations must update their slab reference to Finance Act 2026 to avoid incorrect estimates. The two key structural changes that affect reverse calculations are:
- Rate reductions on slabs 2–5 — The same tax amount now implies a higher income under TY2026-27 than under TY2025-26, because lower rates produce less tax per rupee. Using old slab data understates the income estimate.
- Two new slabs added — The structure now has 8 slabs instead of 6. Tax amounts between PKR 541,000 and PKR 1,424,000 now map to new slabs (29% and 32%) that did not exist in TY2025-26, where the top rate started at PKR 700,000.
- Surcharge abolished — For incomes above PKR 10M, the previous 10% surcharge meant the effective tax rate was 38.5% (35% + 10% surcharge). Reverse calculations no longer need to account for any surcharge in TY2026-27.
For the full breakdown of budget changes, read the Budget 2026-27 Explained article. For the forward calculation (income → tax), use the Salary Tax Calculator.
Frequently Asked Questions — Reverse Tax Calculator Pakistan 2026-27
Use the reverse formula: Gross Income = Lower Slab Limit + ( (Tax Paid − Fixed Tax) ÷ Rate ). First identify which TY2026-27 Finance Act 2026 slab the tax amount falls into, then apply the formula. The free reverse tax calculator on this page does this automatically — enter the annual or monthly tax amount and results appear instantly.
An income tax calculator takes a known income and returns the tax payable. A reverse tax calculator does the opposite — it takes a known tax amount and returns the estimated gross income that generated it. Both use the same FBR slab structure, just in opposite directions.
The calculator on this page now uses Tax Year 2026-27 (Finance Act 2026) slabs effective July 1, 2026. For reference, the TY2025-26 and TY2024-25 slab tables are in the collapsed archive sections below. Using the correct year is important — the same tax amount produces a different income estimate under each year's rates.
Because Finance Act 2026 reduced tax rates. Lower rates mean less tax is collected per rupee of income. In reverse, the same PKR of tax now corresponds to more income than it did under the higher TY2025-26 rates. For example, PKR 72,000 in tax implied PKR 1,480,000 of income under TY2025-26 (15% slab) but implies PKR 1,800,000 under TY2026-27 (11% slab).
For local PKR income, freelancers taxed under the non-salaried business slabs (Section 153) can use this calculator, keeping in mind that business slab rates differ from salaried rates. For foreign remittance income under Section 154A (Upwork, Fiverr, Payoneer), the withholding rates are flat (0.25%–2%) — use the dedicated Freelancer Tax Calculator for those scenarios.
This calculator is calibrated for salaried income (Section 149). Business and non-salaried income (Section 153) uses a different slab structure with higher starting rates — beginning at 15% on the second slab vs 1% for salaried. For business reverse calculations, the income estimates would be lower for the same tax amount. Use the Business Income Tax Calculator for a Section 153 reference.
The tax-free income limit remains PKR 600,000 per year (PKR 50,000 per month) for salaried individuals under Finance Act 2026. Any annual tax amount of zero corresponds to an income at or below PKR 600,000.
Use the reverse calculator with the monthly tax shown on the payslip (multiply by 12 for annual). The result should match the actual gross annual salary. Alternatively, enter the gross salary into the forward salary tax calculator and compare the result with the employer's deduction. A significant mismatch may indicate the employer has not updated to TY2026-27 Finance Act 2026 slabs.
Other Free FBR Tax Calculators
Previous Tax Years — Reverse Reference Archive
Historical slab data for reverse calculations in prior tax years. All active calculations on this page use Tax Year 2026-27 rates.
