Progressive Slabs in Nepal Income Tax Law
The Inland Revenue Department (IRD) of Nepal mandates progressive slab taxation for individual employment income. Separate threshold slabs apply for Single and Married taxpayers, starting at 1% social security tax on the first slab up to 39% on ultra-high incomes (above NPR 50 Lakhs).
Dynamic Fiscal Year Modeling (2083/84+)
Unlike legacy calculators that hardcode fiscal years like 2081/82, the new CalculaTax engine features dynamic fiscal year interpolation. It computes social security fund (SSF) mandatory exemptions (NPR 500,000 for single, NPR 600,000 for married), Employee Provident Fund (EPF), Citizen Investment Trust (CIT), life insurance allowances (up to NPR 40,000), health insurance rebates (up to NPR 20,000), and remote area allowances in real-time.