About ThaiCalPro

ThaiCalPro is a simple, fast, and accessible website that provides practical calculators for people living in Thailand.

Our goal is to help users make better everyday financial decisions by offering easy-to-use tools such as loan calculators, personal income tax estimators, and corporate tax comparison tools. All calculators are designed to present clear results first, with optional details for users who want deeper insights.

We focus on simplicity and clarity. Users can quickly input their information and get immediate results without unnecessary complexity or distractions.

What We Offer

• Loan Calculator
  Estimate monthly payments and understand how each payment is split between principal and interest over time.
• Personal Income Tax (Thailand)
  Get an estimated view of your annual tax based on progressive tax rates, deductions, and withholding tax.
• Corporate Income Tax (Thailand)
  Compare estimated tax obligations for SME and non-SME businesses based on net profit and taxes already paid.

Important Disclaimer

Methodology and sources

We aim to keep every calculator transparent about how it works. Each tool exposes the formula it uses on the page itself, and we review the underlying rules whenever Thai law or official rates change.

• Loan, mortgage, and car loan calculators. Use the standard reducing-balance amortisation formula. Inputs accept a flat annual interest rate, and the schedule is computed by converting the annual rate to a monthly rate and applying the level-payment formula commonly used by Thai banks for housing and personal loans.
• Personal income tax (Thailand). Follows the progressive tax brackets, the standard personal allowance, spouse and parental allowances, and the category-based deductions published by the Thai Revenue Department at rd.go.th.
• Corporate income tax (Thailand). Compares SME and non-SME treatment based on net profit and taxes already paid, following the corporate tax structure published by the Thai Revenue Department.
• VAT calculator. Uses the standard 7% VAT rate currently in force in Thailand, with both inclusive (price already contains VAT) and exclusive (VAT to add on top) modes.
• Salary after tax and credit card minimum payment. Apply commonly published rules for Thai monthly take-home estimates and the typical credit card minimum payment formulas used in the local market.

Last reviewed: May 2026. If you spot a calculator that does not match the latest official rule, please use the contact page to let us know — we update the tools as the rules change.

Our Mission

We believe financial tools should be:

• Easy to understand
• Quick to use
• Accessible to everyone

ThaiCalPro is built to support individuals, employees, and small business owners in Thailand with simple and reliable calculation tools.