International
US vs Singapore Tax System: A Complete Comparison (2025)
By ClearTaxGuide · Updated May 2026 · 10 min read ✓ 2025 official figures
Singapore and the United States have two very different approaches to taxation. Singapore is known for its low, simple, territorial tax system. The US is known for its progressive rates, worldwide taxation of citizens, and significant complexity. This guide breaks down the key differences side by side — useful for anyone comparing the two systems, relocating, or running a business in both countries.
1. System overview
| Feature | 🇸🇬 Singapore | 🇺🇸 United States |
|---|
| Tax authority | IRAS (Inland Revenue Authority of Singapore) | IRS (Internal Revenue Service) |
| Tax basis | Territorial — only Singapore-sourced income taxed | Worldwide — citizens and residents taxed on global income |
| Tax year | Calendar year (Jan–Dec); assessed in following YA | Calendar year (Jan–Dec); filed by April 15 |
| Capital gains tax | None | Yes — 0%, 15%, or 20% depending on income |
| Inheritance/estate tax | None (abolished 2008) | Yes — federal estate tax on estates over $13.99M (2025) |
| Tax treaties with each other | Yes — US-Singapore tax treaty in force |
Source: IRAS.gov.sg; IRS.gov; US-Singapore tax treaty
2. Personal income tax
Both countries use a progressive tax system for individuals, but the rates and thresholds are very different.
Singapore personal income tax rates (2025, Tax Residents)
| Chargeable income (SGD) | Rate |
|---|
| First $20,000 | 0% |
| $20,001 – $30,000 | 2% |
| $30,001 – $40,000 | 3.5% |
| $40,001 – $80,000 | 7% |
| $80,001 – $120,000 | 11.5% |
| $120,001 – $160,000 | 15% |
| $160,001 – $200,000 | 18% |
| $200,001 – $240,000 | 19% |
| $240,001 – $280,000 | 19.5% |
| $280,001 – $320,000 | 20% |
| $320,001 – $500,000 | 22% |
| $500,001 – $1,000,000 | 23% |
| Above $1,000,000 | 24% |
Source: IRAS.gov.sg — Income Tax Rates (YA 2025)
SG60 rebate (2025 only): To mark Singapore's 60th year of independence, all tax resident individuals receive a one-time 60% rebate on income tax payable, capped at SGD 200. IRAS applies this automatically — no action needed.
US federal income tax rates (2025, Single filers)
| Taxable income (USD) | Rate |
|---|
| $0 – $11,925 | 10% |
| $11,926 – $48,475 | 12% |
| $48,476 – $103,350 | 22% |
| $103,351 – $197,300 | 24% |
| $197,301 – $250,525 | 32% |
| $250,526 – $626,350 | 35% |
| Above $626,350 | 37% |
Source: IRS Revenue Procedure 2024-40 (Tax Year 2025)
Key difference: Singapore's top rate of 24% only applies above SGD 1,000,000 (~USD 750,000). The US reaches its top rate of 37% at USD 626,350 for single filers — a much lower threshold. For middle-income earners, Singapore's effective tax rate is typically significantly lower than the equivalent US rate.
3. Corporate tax
| Feature | 🇸🇬 Singapore | 🇺🇸 United States |
|---|
| Headline corporate rate | Flat 17% | Flat 21% federal + 0%–12% state |
| New startup exemption | 75% exempt on first SGD 100,000; 50% on next SGD 100,000 (first 3 YAs) | No equivalent federal startup exemption |
| Partial tax exemption (ongoing) | 75% exempt on first SGD 10,000; 50% on next SGD 190,000 | Not applicable |
| 2025 corporate rebate | 50% rebate on tax payable, capped at SGD 40,000 | None |
| Dividend tax | None (one-tier system — tax paid at corporate level) | Yes — qualified dividends taxed at 0%, 15%, or 20% |
| Capital gains at corporate level | Generally not taxable | Taxed at standard corporate rate (21%) |
Source: IRAS corporate income tax rates 2025; IRS Publication 542
Effective rate for Singapore SMEs: After the startup tax exemption and partial tax exemption, many small Singapore companies pay an effective corporate tax rate well below 10% in their early years — making Singapore one of the most attractive jurisdictions for small business formation in Asia.
4. GST (Singapore) vs sales tax (US)
| Feature | 🇸🇬 Singapore GST | 🇺🇸 US Sales Tax |
|---|
| Rate | 9% (effective January 1, 2024) | No federal rate — varies by state (0%–10%+) |
| Who collects it | Federal government (IRAS) | State and local governments |
| Registration threshold | SGD 1,000,000 annual turnover | Varies by state (often ~$100,000 in sales) |
| Filing frequency | Quarterly (Form F5 to IRAS) | Varies by state — monthly, quarterly, or annually |
| Zero-rated supplies | Exports, international services | Food, medicine, and other items vary by state |
| Exempt supplies | Residential property, most financial services | Varies significantly by state |
Source: IRAS GST guide 2025; Sales Tax Institute state rates database
US sales tax complexity: Unlike Singapore's uniform 9% GST, US sales tax is a patchwork of over 10,000 jurisdictions. A business selling nationwide faces a different rate in every state, county, and city. Five states have no sales tax at all (Alaska, Delaware, Montana, New Hampshire, Oregon).
5. Capital gains tax
| Asset type | 🇸🇬 Singapore | 🇺🇸 United States |
|---|
| Shares and stocks | Not taxable (generally) | 0%, 15%, or 20% (long-term); ordinary rate (short-term) |
| Real estate | Not taxable (generally) | 0%, 15%, or 20% + possible depreciation recapture |
| Cryptocurrency | Not taxable for investors; may be taxed as income for traders | Taxed as property — capital gains rules apply |
| Business assets | Generally not taxable | Taxed — ordinary or capital rate depending on asset type |
Source: IRAS capital gains guidance; IRS Publication 550 (2025)
Singapore caveat: Singapore does not have a capital gains tax, but IRAS may reclassify gains as ordinary income if it determines the activity constitutes a trade or business. Frequent buying and selling of assets — particularly shares or property — can trigger this reclassification.
6. Self-employed and freelancers
This is where the two systems differ most significantly for independent professionals.
| Feature | 🇸🇬 Singapore | 🇺🇸 United States |
|---|
| Tax on self-employment income | Personal income tax only (progressive rates 0%–24%) | Income tax + self-employment tax (15.3% SE tax) |
| Social security equivalent | CPF contributions (employee + employer) — not a tax, but mandatory savings | Social Security + Medicare included in 15.3% SE tax |
| CPF / SE tax rate for self-employed | Self-employed contribute to MediSave only (8%–10.5% of net trade income, capped) | 15.3% on net self-employment income (12.4% SS + 2.9% Medicare) |
| Quarterly payments | Not required — annual tax assessment by IRAS | Required quarterly estimated payments if owing $1,000+ |
| Business expense deductions | Deductible if "wholly and exclusively" for trade | Deductible on Schedule C if "ordinary and necessary" |
| Home office deduction | Allowable in proportion to business use | Allowable — simplified ($5/sq ft) or actual expense method |
Source: IRAS self-employed income guide 2025; IRS Schedule C instructions 2025
Key insight for freelancers: A self-employed professional earning SGD 100,000 in Singapore pays income tax plus MediSave contributions only. The equivalent US freelancer earning ~USD 75,000 pays income tax plus a 15.3% self-employment tax on top. The US self-employment tax burden is one of the most significant differences between the two systems for independent workers.
7. Moving between the two countries
This section is particularly relevant for Singapore professionals relocating to the US, or US citizens working in Singapore.
Singapore professional moving to the US
- Once you become a US tax resident (Green Card or substantial presence test), you pay US tax on worldwide income — including any Singapore income
- The US-Singapore tax treaty provides relief from double taxation in many cases
- You will need to file US Form 1040 plus potentially Form 2555 (Foreign Earned Income Exclusion) or Form 1116 (Foreign Tax Credit)
- The Foreign Earned Income Exclusion allows excluding up to $130,000 of foreign earned income from US tax in 2025 if you meet the bona fide residence or physical presence test
- Quarterly estimated taxes become required once you earn US self-employment or other untaxed income
US citizen working in Singapore
- US citizens must file a US tax return regardless of where they live
- You pay Singapore taxes on Singapore-sourced income
- The US-Singapore treaty and Foreign Tax Credit typically prevent paying full tax twice
- FBAR filing (FinCEN 114) required if Singapore bank accounts exceed $10,000 at any point during the year
- FATCA Form 8938 may also be required depending on asset thresholds
Important: Cross-border tax situations between the US and Singapore are complex and highly individual. This guide provides a general comparison only. Anyone with income in both countries should consult a tax professional familiar with both jurisdictions.
Quick comparison: who pays more?
🇸🇬 Singapore generally better for:
- High earners (top rate 24% vs US 37%)
- Investors (no capital gains tax)
- Business owners (17% flat corporate tax)
- Self-employed (no SE tax equivalent)
- Estate planning (no inheritance tax)
🇺🇸 US generally better for:
- Lower-income earners (10% starting bracket)
- Families (Child Tax Credit, Dependent Care credits)
- Homeowners (mortgage interest deduction)
- Retirement savers (401k, IRA tax advantages)
- Those with large business losses (generous carryforward rules)
8. Frequently asked questions
Is Singapore tax lower than the US?
For most income levels, yes. Singapore's top personal income tax rate is 24% (on income above SGD 1,000,000), while the US top rate is 37% (on income above USD 626,350 for single filers in 2025). Singapore also has no capital gains tax and no inheritance tax, giving it a significant advantage for investors and high earners.
Does Singapore have a capital gains tax?
No. Singapore does not impose capital gains tax on individuals or companies. Gains from shares, real estate, and other capital assets are generally not taxable. However, IRAS may reclassify gains as ordinary income if it determines the activity constitutes a trading business rather than passive investment.
What is the GST rate in Singapore vs US sales tax?
Singapore's GST is 9% nationwide (effective January 1, 2024). The US has no federal sales tax — state and local rates vary from 0% (in states like Oregon and Montana) to over 10% in some cities when combined with local taxes.
If I move from Singapore to the US, do I pay taxes in both countries?
The US taxes citizens and residents on worldwide income regardless of where they live. Once you become a US tax resident, you may owe US tax on Singapore income. The US-Singapore tax treaty and Foreign Tax Credit help prevent full double taxation in most cases, but the situation is complex and depends on your specific income sources and residency status.
What is Singapore's corporate tax rate vs the US?
Singapore's corporate tax rate is a flat 17% for all companies. The US federal corporate rate is a flat 21%, with state corporate taxes adding 0%–12% on top. After Singapore's startup exemptions and the 2025 50% corporate rebate (capped at SGD 40,000), many Singapore SMEs pay an effective rate well below 17%.