10% Off $9.99 — You Pay $8.99
10% of $9.99 is $1.00, so the price drops from $9.99 to $8.99. Below are the same figure with sales tax added, what happens if a second discount stacks on top, and the full tier table for this price so you can compare without retyping it.
The arithmetic, line by line
| Step | Calculation | Result |
|---|---|---|
| Discount rate as a decimal | 10 ÷ 100 | 0.10 |
| Discount amount | $9.99 × 0.10 | $1.00 |
| Final price | $9.99 − $1.00 | $8.99 |
| Price paid, share of original | $8.99 ÷ $9.99 × 100 | 90% |
On the price ladder $9.99 is entry 2 of 18, sitting $5.00 above $4.99 and $5.00 below $14.99. The same 10% label saves $0.50 on $4.99 against $1.00 here, so the percentage is identical and the money is not — the shelf label tells you the rate, never the amount.
With sales tax on top
Tax is charged on the discounted amount, so the rate applies to $8.99 rather than $9.99.
| Tax rate | You pay | Tax portion |
|---|---|---|
| 5% | $9.44 | $0.45 |
| 6% | $9.53 | $0.54 |
| 7% | $9.62 | $0.63 |
| 8% | $9.71 | $0.72 |
| 9% | $9.80 | $0.81 |
| 10% | $9.89 | $0.90 |
If a second discount stacks
"Take an extra 20% off sale prices" is a second cut on the already-reduced price, not on the original. That is why the totals below do not add up to 20% or 30%.
| Second discount | Price after 10% | After the extra cut | Combined |
|---|---|---|---|
| Extra 10% off | $8.99 | $8.09 | 19% total |
| Extra 20% off | $8.99 | $7.19 | 28% total |
Every discount on $9.99
| Off | You pay | You save |
|---|---|---|
| 10% | $8.99 | $1.00 |
| 15% | $8.49 | $1.50 |
| 20% | $7.99 | $2.00 |
| 25% | $7.49 | $2.50 |
| 30% | $6.99 | $3.00 |
| 40% | $5.99 | $4.00 |
| 50% | $5.00 | $5.00 |
| 60% | $4.00 | $5.99 |
| 70% | $3.00 | $6.99 |
| 75% | $2.50 | $7.49 |
10% off nearby prices
| Original price | Final price | Savings |
|---|---|---|
| $4.99 | $4.49 | $0.50 |
| $14.99 | $13.49 | $1.50 |
| $19.99 | $17.99 | $2.00 |
| $24.99 | $22.49 | $2.50 |
Frequently asked
What is 10% off $9.99?
$8.99. The discount is 10% of $9.99, which is $1.00, and that comes straight off the price: $9.99 − $1.00 = $8.99.
How much do I save at 10% off $9.99?
$1.00 on a $9.99 item, which is the 10% that comes off before the till total of $8.99. The share you still pay is 90%, and sales tax is charged on that smaller figure rather than on the original.
Is 10% off plus another 10% off the same as 20% off?
No. Stacked percentages multiply, so 10% then 10% is 19% off in total, not 20%. On $9.99 the first cut leaves $8.99, and a second 10% takes it to $8.09.
Does sales tax apply before or after the discount?
After, in every US state that taxes the sale. Tax is charged on what you actually pay, so at 8% you owe $9.71 on a $8.99 subtotal, not 8% of $9.99. There are exceptions for manufacturer coupons and mail-in rebates, but a shelf discount is applied first.