8.5% Tax on $20
Tax amount, total price, step-by-step formula, and regional context.
Tax Amount
$1.70
Total Price
$21.70
Effective Rate
7.8341%
$20 × 1.085 = $21.70
Formulas
Add tax (total):
Price × (1 + Rate/100)
Tax amount only:
Price × Rate/100
Remove tax (pre-tax):
Total ÷ (1 + Rate/100)
Effective rate:
(Tax ÷ Total) × 100
Step-by-Step
1
Convert to decimal
8.5 ÷ 100 = 0.085
2
Calculate tax
$20 × 0.085 = $1.70
3
Add to price
$20 + $1.70 = $21.70
4
Verify (reverse)
$21.70 ÷ 1.085 = $20 ✓
Pre-tax
$20
Tax added
$1.70
Total
$21.70
Eff. rate
7.8341%
Reverse: Remove 8.5% from $21.70
If you have a tax-inclusive total of $21.70 and need to extract the 8.5% tax:
$21.70 ÷ 1.085 = $18.43 pre-tax
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Where is 8.5% used? — US combined rate
Typical combined rate across many US metro areas.
Real-World Context
Adding 8.5% tax to a $20 purchase brings the total to $21.7. The $1.7 tax is collected and remitted to the tax authority.
Frequently Asked Questions
How much is 8.5% tax on $20?
8.5% tax on $20 is $1.70. Total including tax: $21.70. Formula: $20 × 0.085 = $1.70, then $20 + $1.70 = $21.70.
How do I remove 8.5% tax from $21.70?
Divide by 1.085: $21.70 ÷ 1.085 = $18.43 pre-tax. Tax component: $3.27.
Why is the effective rate (7.8341%) lower than 8.5%?
The 8.5% rate applies to the pre-tax amount ($20). The effective rate — tax as a share of the total ($21.70) — is always lower because the denominator is larger.
Where is 8.5% tax used?
US combined rate: Typical combined rate across many US metro areas. Always verify the current rate with your local tax authority.
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