An offshore accounting cost savings calculator is only as honest as the numbers you put into it, and most of the free ones put in their own. They supply the offshore rate, compare it against a salary, and return a percentage.
Two things are wrong with that. A salary is not what a seat costs, because the Bureau of Labor Statistics puts wages and salaries at 67.3% of total employer cost in the occupational group accountants sit in. And the review work that stays in your firm never shows up in the subtraction at all.
Run it in the other direction. Price one hour of your own capacity, then solve for the highest rate a provider could charge and still leave you ahead.
What an Offshore Accounting Cost Savings Calculator Has to Include
Five inputs decide the answer. Four of them you have to produce yourself, and they are the four below. The fifth, the provider's price, is the only one a vendor's form already knows, and Step 3 turns it into a number you can compare against them.
Your loaded cost per hour worked. Not the salary, and not the salary divided by a full year of paid hours. The number you need is what the seat costs your firm for every hour it actually produces, because that is the unit a provider's rate is quoted in.
The hours you would genuinely move. Only repeatable, documented work transfers cleanly. Hours that come back for rework are bought twice, once from the provider and once from your own staff at the worst point in the season.
The review that stays behind. The partner's judgment and the signature never leave. What belongs in the calculation is the review the arrangement adds on top of what the work already took, and leaving that difference out is what produces the tidy percentages.
The setup you pay once. Onboarding time, extra software seats, and the compliance work of moving client data all land in year one. Spread over the hours you move, they change the break-even more than most people expect.
Step 1: Price One In-House Hour
Start From the Wage
Use your own pay bands first, and use national data as the sanity check on them. The mean annual wage for accountants and auditors was $94,750 in the May 2025 Occupational Employment and Wage Statistics survey, and the mean hourly wage was $45.56 (BLS, Occupational Employment and Wage Statistics, May 2025).
For a bookkeeping seat the reference point is lower. The same survey puts the mean annual wage for bookkeeping, accounting, and auditing clerks at $53,560 (BLS, Occupational Employment and Wage Statistics, May 2025).
Both are national figures across every industry that employs those roles, so treat them as a check on your offer letters rather than a replacement for them.
Gross It Up to Employer Cost
Pay is the visible part of the seat. For management, business, and financial occupations in private industry, the group that contains accountants, employer costs averaged $87.69 per hour worked in March 2026, of which wages and salaries were 67.3% and benefits were 32.7% (BLS, Employer Costs for Employee Compensation, private industry by occupational group).
The gap between that ratio and the headline one is easy to miss. Across all private industry occupations the wage share is 69.9%, so a firm that grosses an accountant's pay up at the all-industry ratio understates its own seat (BLS, Employer Costs for Employee Compensation, private industry by occupational group).
One adjustment keeps the gross-up honest. In that same table paid leave is counted as a benefit rather than as wages, at 9.6% of total employer cost (BLS, Employer Costs for Employee Compensation, private industry by occupational group). An annual salary already pays for the holidays and vacation days it covers, so gross the salary up on the wage share plus the paid leave share, not on the wage share alone. Doing it the other way charges the same leave twice and makes the seat look more expensive than it is.
Count payroll taxes once while you are here. Legally required benefits, the line that carries Social Security, Medicare, unemployment insurance and workers' compensation, cost employers $5.51 per hour worked in that occupational group, or 6.3% of total compensation, and that money is already inside the benefit load (BLS, Employer Costs for Employee Compensation, private industry by occupational group).
Divide by the Hours That Actually Get Worked
Federal compensation costs are published per hour worked rather than per hour paid, and that is the unit you want, because a provider bills you for hours instead of for a year of employment. Your seat is paid for holidays, vacation and sick days it does not produce in, so the denominator is the year's paid hours minus the leave your policy grants and your people actually take.
``` One in-house hour, worked example
annual wage 94,750 BLS OEWS, May 2025, mean wage share of employer cost 67.3% BLS ECEC, Mar 2026, group paid leave share 9.6% BLS ECEC, Mar 2026, group salary share of employer cost 76.9% 67.3 + 9.6 employer cost per year 94,750 / 0.769 = 123,212
paid hours in the year 2,080 less holidays, 10 days -80 less leave taken, 15 days -120 hours actually worked 1,880
loaded cost per hour worked 123,212 / 1,880 = 65.54 ```
Use your own leave policy in those two subtraction lines. A firm that grants more leave has a higher cost per productive hour, which raises, not lowers, what it can afford to pay outside.
Step 2: Count the Hours You Would Actually Move
Take the hours by service line, not for the firm as a whole. Bookkeeping, individual returns and business returns carry different review depths, and a blended number hides the line where the saving is real.
Then discount them twice. Work that is not documented gets explained rather than delegated, and work that comes back for correction is paid for a second time.
``` Hours you can actually move, one service line
hours the work takes in-house today A share that repeats and is documented B less hours that come back for rework C
hours truly moved H = (A x B) - C ```
If B is small because nothing is written down, the honest first project is the documentation, not the search for a provider.
Step 3: Convert Any Quote Into a Cost Per Usable Hour
There is no public rate card for offshore accounting capacity the way there is public wage data for a US seat, so this input has to come from the provider in writing. Ask for it against a fixed scope, then convert whatever shape it arrives in into one unit.
``` Any price, converted to cost per usable hour
hourly rate rate / share of contracted hours usable on your files monthly seat monthly fee / hours that seat works your files per return fee / hours that return takes your own staff today ```
The usable share is where quotes separate. Contracted hours include ramp weeks, the provider's public holidays, and time spent on questions rather than output, and none of those produce a finished file. Count the pace difference in the same fraction: if a return your own staff closes in six hours takes the provider eight, that gap belongs in the usable share alongside the ramp weeks, or the comparison credits the provider with your speed and the break-even rate comes out too high.
Get four things in writing before you use the number: exactly what work is in scope, which software the team works in, how many review layers are included in the price and who performs them, and what happens to the price when volume moves. A rate quoted without a review layer is not comparable to one that includes it.
Step 4: Price What Stays in Your Firm
Every honest saving calculation subtracts on the outsourced side too.
Retained review. Estimate the review hours your firm will spend per hour of work moved beyond what that same work already absorbs in-house, then price the difference at the loaded cost of whoever performs it, calculated the same way as Step 1. Only the extra review belongs in the comparison, because review the work would have needed anyway is paid for either way. It is still the input most vendor calculators omit entirely.
Onboarding. Someone writes or records the process, answers week-one questions, and grades early output. That effort is front-loaded on purpose, and it belongs in year one rather than spread across a decade.
Software and access. Extra named users in your tax and workflow platforms, secure file exchange and access controls are recurring costs that scale with the people you add, wherever they sit.
Consent and redaction. For tax return information, the Treasury regulations under section 7216 require the taxpayer's knowing and voluntary written consent, signed and dated, before a disclosure to a preparer outside the United States. For a return in the Form 1040 series there is a further limit: the US preparer may not obtain consent to disclose the Social Security number to a preparer abroad, and must redact or otherwise mask it, unless the disclosure runs through an adequate data protection safeguard defined by the Secretary in published guidance and the consent request verifies that the safeguard is being maintained (eCFR, disclosure or use permitted only with the taxpayer's consent).
Vendor oversight. An accountant or other tax preparation service in the business of completing income tax returns is a financial institution under the FTC Safeguards Rule (eCFR, Safeguards Rule definitions), which means the firm has to take reasonable steps to select service providers capable of maintaining appropriate safeguards, require those safeguards by contract, and periodically assess the provider (eCFR, Safeguards Rule, elements of an information security program). Consent cycles, redaction, contract review and periodic assessment are partner and administrator hours with a deadline attached, so price them rather than assuming them.
Step 5: Solve for the Rate That Breaks Even
This is the output the vendor calculators cannot give you, because it makes their own price the variable being tested. Instead of accepting a rate and reporting a saving, set the saving to zero and solve for the rate.
``` The rate that breaks even, worked example (C is from Step 1; r, R, S and H are your own numbers)
C loaded in-house cost per hour worked 65.54 r extra review hours per hour moved 0.15 R reviewer loaded cost per hour 120.00 S first-year setup, onboarding + licenses 6,000 H hours moved in the year 900
break-even rate, year one C - (r x R) - S/H 65.54 - 18.00 - 6.67 = 40.87
break-even rate, steady C - (r x R) 65.54 - 18.00 = 47.54
per contracted hour, if 88% of hours are usable 40.87 x 0.88 = 35.97
annual saving ((C - price per usable hour) - (r x R)) x H - S ```
Read the result as a ceiling, not a target. A quote below the break-even rate saves money on those assumptions, and a quote above it costs money however good the percentage on the vendor's page looks. The gap between the year-one and steady-state lines is simply the price of starting.
The steady-state line is also the number to re-run each year. Your in-house cost per hour rises with pay bands and benefit costs, so a deal that broke even last season may be comfortably ahead this one, and a rate you rejected once deserves a second look.
What Moves the Answer More Than the Rate
The review ratio moves the answer more than small differences in the rate do. Double the review hours you keep per hour moved and the defensible rate falls sharply, which is why a cheap rate attached to a thin review chain is usually the more expensive option.
``` Sensitivity, same inputs, review ratio doubled
r = 0.15 65.54 - 18.00 - 6.67 = 40.87 r = 0.30 65.54 - 36.00 - 6.67 = 22.87 ```
Utilization matters next. Capacity that idles in June is paid for out of the season it saved, so seasonal work usually compares better against a team billed on volume than against a dedicated seat held all year.
Rework matters third, and it compounds with the review ratio. Files that come back consume both the hour you already bought and the reviewer hour you were counting on saving.
Common Questions
How Do I Calculate Cost Savings?
Put both sides in the same unit, then subtract. Take your cost per hour worked in-house, subtract the provider's cost per usable hour and the cost of the extra review hours you keep, multiply by the hours you actually move, then take off what you spend once to set it up.
Which Calculator Should a Firm Trust?
The one that asks for your review ratio. A calculator that never asks how much review stays in your firm is measuring rate arbitrage on a single seat, which is the easiest part of the question and the part least likely to decide it.
What About an Outsourced Controller or CFO?
The method holds, the inputs change. Advisory-level work carries a higher in-house cost per hour and usually a lower transferable share, because judgment work is harder to document, so run it as its own service line rather than blending it into a firm-wide average.
What If the Seat Is Empty Today?
Then the loaded salary in Step 1 is a forecast rather than a cost you carry, and the honest comparison is against the work you are turning away. Price both versions and say plainly which one your answer used.
The Number to Act On
The only saving worth acting on is the one you built from your own pay bands, your own hours and your own review depth. If the break-even rate you calculate sits close to what providers quote, the answer is a different scope rather than a different vendor. If it sits far above, the prize is usually the work you can now accept rather than the payroll line you shrank.
Then test the arithmetic on real files before you trust it. Since 2022 we have placed 30+ trained offshore accountants and tax preparers inside 20+ US firms. Accountably runs a Free 40-Hour Proof Pilot on a fixed block of your own work, prepared on your software and your process and put through full review, so your reviewer grades real output before any client file depends on it. If someone is not the right fit in the first 30 days, we replace them free.
Don't trust us. Test us.