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Finance Tools

EMI, GST, and financial calculators

Create professional invoices with taxes, discounts and templates, then work out mortgage payments, salary breakdowns, income tax across 11 countries, and GST — the kind of arithmetic that's easy to get subtly wrong by hand. Freelancers billing a client, home buyers comparing loan offers, and anyone sanity-checking a payslip use these calculators for the same reason: the formulas are shown alongside the result, and the inputs — your income, your loan amount — are calculated in your browser and never transmitted anywhere.

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Guides for Finance Tools

Learn the formulas, assumptions, and best practices behind finance tools in our Finance Guides.

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Finance Tools — Frequently Asked Questions

Common questions about using finance tools on ForgePlug.

Are these financial calculators accurate?
Yes. Our calculators use standard financial formulas — Naegele's rule for GST, amortization formulas for mortgages, country-specific tax brackets for income tax, and salary structure models for take-home pay. All calculations are verified against official sources.
Do my financial details get uploaded?
No. Every financial calculator runs entirely in your browser. Your income, expenses, loan details, and other financial data never leave your device. Nothing is stored or transmitted.
Which countries are supported for salary and tax calculations?
The Global Salary Calculator covers 8 countries. The Income Tax Calculator covers 11 countries including India (old and new regimes), USA (federal, FICA, and optional state tax for 13 states), UK, Germany, France, Netherlands, Spain, Italy, Sweden, Switzerland, and Ireland.
Can I export my calculations?
Yes. Most financial calculators support PDF export, CSV export, and printing. You can save your mortgage amortization schedule, GST invoice breakdown, salary breakdown, or tax calculation for your records.
Is the GST calculator suitable for business invoicing?
Yes. The GST Calculator supports multi-line invoices with per-item GST rates, discounts, shipping, round-off, and automatic CGST/SGST splitting for intra-state supplies and IGST for inter-state supplies. It supports all standard GST slabs from 0% to 28%.
What interest rates and terms are available for the mortgage calculator?
The Mortgage Calculator supports any interest rate and loan term (15, 20, 30 years, or custom). You can also add property tax, insurance, HOA fees, and model extra payments to see how they affect your loan.
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