How to Calculate Singapore GST (9%) in 2025

Goods and Services Tax (GST) in Singapore is currently 9%. Whether you are a business owner pricing your products or a consumer checking a bill, knowing how to calculate this correctly is essential.

1. Adding GST (Exclusive → Inclusive)

If you have a price before tax and want to find the final total: Formula:

Price × 1.09

Example:

• Price: S$100
• Calculation: $100 × 1.09 = S$109
• Total: S$109.00

Use our Singapore GST Calculator to do this instantly.

2. Removing GST (Inclusive → Exclusive)

If you have a total price that already includes GST and want to find the original price: Formula:

Total ÷ 1.09

Example:

• Total: S$109
• Calculation: $109 ÷ 1.09 = S$100
• Pre-tax Price: S$100.00
• GST Amount: S$9.00

GST Rate History in Singapore

• 2024 - Present: 9%
• 2023: 8%
• Pre-2023: 7%

Common Mistakes

• Don't just subtract 9%: Subtracting 9% from $109 (109 - 9.81 = 99.19) gives the wrong answer. You must divide by 1.09 to reverse the tax.
• Rounding: GST is usually rounded to the nearest cent.

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