Tax Admin Time Cost Calculator NZ 2026

Reviewed 5 August 2026.

Quick answer On the default hours, tax and invoicing admin takes 104 hours a year. At a $95 charge-out rate with 60% of that time genuinely displacing paid work, it costs $5,928.00 a year in revenue you did not earn. A service fee of $1,500 plus GST really costs $1,005.00, so paying for it is $3,589.20 ahead. The break-even charge-out rate is $20.78 an hour.
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Time spent on invoicing, receipts, GST returns and the annual return is real cost, but it never appears anywhere because nobody invoices you for it. That makes doing it yourself look free when it is not, and it is why the comparison between doing your own admin and paying for it is so often decided on the fee alone. The honest version prices the hours. There is one important qualification, and this calculator insists on it: an hour of admin only costs you revenue if you would otherwise have sold that hour. Someone with more work than they can take is losing billable time; someone with gaps in the diary is losing a Sunday evening, which is worth something but not the same thing. The recoverable share input is where you make that call honestly, and setting it below 100 percent is the right answer for most people. On the other side of the comparison, a service fee is not what you pay either: a GST-registered business reclaims the GST and the remainder is deductible, so a fee advertised at $1,500 plus GST leaves you about a thousand dollars down. The break-even figure at the end is the charge-out rate at which the two sides balance.

Hours a year, by task

TaskHours per yearRemoved by a serviceHours you keep
Invoicing and chasing payment8
Expenses and receipts12
GST returns1.8
Annual return and year end1.6
Your admin costs
$5,928.00
104 hours, 60% recoverable
Paying is ahead by
$3,589.20
time released, less real fee
Break-even rate
$20.78
above this, paying pays

Both sides of the comparison

Total admin hours a year104
Hours a service would remove80.6
Hours you would still spend23.4
Share that displaces paid work60%
Value of the hours released$4,594.20
Fee you pay, including GST$1,725.00
Less GST reclaimed$225.00
Less tax deduction at 33%$495.00
Real cost of the service$1,005.00
Net position$3,589.20
Cost of all your admin time$5,928.00
Break-even charge-out rate$20.78
This is an estimate. It prices time at the rate you enter and assumes the service fee is fully deductible business expenditure. It does not price the cost of errors, missed deadlines, penalties, or interest on tax paid late, all of which fall on the side of getting help. Confirm deductibility with Inland Revenue or your accountant.

Why the recoverable share is the honest part

Every calculation of this kind can be made to say whatever you want by choosing the charge-out rate and assuming every hour is billable. It rarely is. The question to ask is whether, if these hours vanished tomorrow, you would fill them with paid work or with something else. For a tradesperson turning down jobs, the answer is paid work and the share is close to 100 percent. For a consultant with a half-full diary, the hours would be filled with marketing, rest or family, which have real value but do not appear as revenue. Setting the share at 50 or 60 percent produces a comparison that survives scrutiny, and it usually still favours paying someone.

The hours a service does not remove

No arrangement removes everything. Receipts still need capturing, questions still need answering, and what has been prepared still needs a look before it is filed. What tends to disappear is the part with deadlines attached: the calculation, the filing, the payment, and the chasing. Modelling each task separately rather than assuming the whole burden goes is what keeps the answer defensible, and it is why the table above asks for a removal share per task rather than one number for everything.

Worked example

A contractor spends 40 hours a year on invoicing and chasing, 30 on expenses and receipts, 18 on GST returns and 16 on the annual return, a total of 104 hours. A service would remove most of the deadline-driven work, leaving 23.4 hours and releasing 80.6. At a $95 charge-out rate with 60% of the time genuinely displacing paid work, those released hours are worth $4,594.20.

The service is advertised at $1,500 plus GST, so $1,725.00 is paid. The GST of $225.00 is reclaimed and the deduction saves $495.00 at a 33 percent marginal rate, leaving a real cost of $1,005.00. Paying is therefore $3,589.20 ahead on the released hours alone. The charge-out rate at which the two sides balance is $20.78 an hour, which is well below what almost any self-employed person bills.

How this is calculated

Hours released is each task's hours multiplied by the share a service would remove. The value of those hours is hours released multiplied by your charge-out rate multiplied by the recoverable share. The fee paid is the headline plus 15 percent GST; the GST is reclaimed and the remainder is deductible, with the tax saved being that remainder multiplied by your marginal rate, giving the real cost. The net position is the value released less the real cost. The break-even charge-out rate is the real cost divided by the product of hours released and the recoverable share, which is the rate at which the two sides are equal.

Related NZ calculators

Data sources: the rates and thresholds on this page are maintained against Inland Revenue. Figures are checked twice monthly.

Frequently asked questions

Is my admin time really worth my charge-out rate?

Only the portion that displaces work you could have sold. If you are fully booked and doing admin on Sunday evening, the hour costs you a Sunday evening rather than lost revenue, and valuing it at your full rate overstates the case. If you turn work away or finish jobs later because of admin, the rate is exactly right. The recoverable share input exists so you can be honest about which situation you are in, and setting it below 100 percent is the realistic answer for most people.

How many hours does tax admin actually take a sole trader?

It varies enormously with how organised the system is rather than with the size of the business. The defaults here assume weekly invoicing and chasing, a monthly pass at expenses and receipts, two-monthly GST returns and an annual return, which comes to a little over a hundred hours a year. Someone with a clean system and few transactions will spend far less; someone reconstructing a year of receipts in one weekend will spend more, and will make more mistakes doing it.

What is the break-even rate?

It is the charge-out rate at which the value of the hours saved exactly equals the real cost of the service. Above that rate, paying someone releases time worth more than it costs; below it, doing the work yourself is cheaper. Because the service fee is deductible and the GST is reclaimable for a registered business, the break-even rate is lower than dividing the headline fee by the hours would suggest.

Does paying for a service really remove all the hours?

No, and assuming it does is the main way this comparison gets overstated. You still photograph receipts, still answer questions, still check what has been produced. What a service typically removes is the calculation, the filing, the payment deadlines and the chasing. The hours removed input lets you model the realistic share rather than assuming the whole burden disappears, and being conservative there gives a comparison you can rely on.

What about the value of not thinking about it?

It is real and this calculator does not attempt to price it. Missed deadlines carry penalties and interest, a tax bill that arrives unfunded can cost far more than any fee, and the mental load of an unresolved obligation has a cost that never appears in an hours calculation. Treat the figure here as the floor of the argument rather than the whole of it.