Work backwards from a tax-inclusive total at the Connecticut rate
÷ 1.0635
Divide a Connecticut total by this to remove 6.35% sales tax
How to back out 6.35% sales tax in Connecticut
If you know a total that already includes Connecticut sales tax and you need the sale figure
underneath it, divide — do not subtract. The state rate in Connecticut is 6.35%,
so the divisor is 1.0635.
Pre-tax price = Total ÷ 1.0635 Sales tax = Total − Pre-tax price
This is the number most state returns actually ask for. Your card reader and your cash box
both hand you a blended figure; the return wants sales and tax apart.
A worked example at the Connecticut rate
A $100.00 total at 6.35% breaks down as $94.03 in sales
and $5.97 in tax.
Across a show, $2,150.00 taken at that rate is $2,021.63
of sales with $128.37 of tax inside it.
The mistake that costs you money
Taking 6.35% off the total instead of dividing gives $136.53 of "tax" on that
$2,150.00 day — against the correct $128.37. The gap is $8.16, and it runs the wrong way:
you would under-report your sales and over-report the tax you collected.
The reason is simple. The 6.35% was applied to the smaller pre-tax figure, not to the total,
so a percentage of the total is always too big.
When Connecticut vendors need this
Round, tax-inclusive pricing — $20 rather than $18.52 plus tax,
which speeds up every market transaction but buries the tax.
Filing a Connecticut return, which asks for gross sales separately from tax.
Reconciling a card deposit, which arrives as sales minus fees but still
containing the tax.
Checking a receipt against the rate that should have applied.
Local rates apply on top of the state rate in much of the country. If your venue's combined
rate is higher than 6.35%, divide by 1 plus that combined rate instead — the method does not
change. To go the other way, from price to tax, use the
Connecticut sales tax calculator.
How do I calculate reverse sales tax in Connecticut?
Divide the tax-inclusive total by 1.0635. A $100.00 total becomes $94.03 in sales and $5.97 in tax at the 6.35% state rate.
How do I back out Connecticut sales tax from my day's takings?
Same division. $2,150.00 taken at 6.35% is $2,021.63 of sales with $128.37 of tax inside it.
Why can't I just subtract 6.35% from the total?
Because the rate applied to the pre-tax price, not the total. Subtracting 6.35% from $2,150.00 gives $136.53 of tax instead of the correct $128.37 — you would under-report sales and over-report tax.
What if local sales tax applies on top?
Use the combined rate. If the venue's total rate is higher than the 6.35% state rate, divide by 1 plus that combined figure. The method is identical.
What is the sales tax rate in Connecticut?
The base state rate is 6.35%. Counties and cities may add their own on top in much of the country, so check the combined rate at the venue.