Money management for tradies in NZ: paid in lumps, staying ahead

Most money advice assumes you get paid the same amount on the same day every fortnight. That advice is useless to a builder who invoiced three jobs in March, got paid for one of them in April, and has a GST return due regardless.

Tradies are not bad with money. The money arrives in irregular chunks, and the bills attached to it arrive months later on someone else's schedule. By the time the tax bill lands, the money that was meant to cover it has turned into a ute deposit, a quiet fortnight, and a materials run.

The fix is not budgeting harder. It is splitting every payment into buckets the day it hits your account, by percentage, so a $2,400 job and an $18,000 job get handled the same way without you doing any maths.

Why the money feels like yours when it is not

When a client pays an $11,500 invoice, your banking app shows $11,500. That is the number your brain works with. But a solid chunk of it was never yours.

If you are GST registered, some of that payment is GST you collected on Inland Revenue's behalf. GST is charged at 15% (Inland Revenue, GST). Another slice is income tax on the profit. Another slice has to cover materials on the next job, the van, insurance, and the fortnight in July when nobody is building anything.

A wage earner never thinks about this, because payroll takes it out before they see it. Self-employed tradies have to build their own payroll. That is the entire job.

Why a bank automatic payment does not solve it

The obvious move is to set up an automatic payment. Every Friday, $400 to the tax account. Done.

It does not hold. An automatic payment moves a fixed amount on a fixed date, and your income does neither. In a week where nothing got paid, the transfer fails or pushes you into the red. In a week where a big progress claim landed, $400 is nowhere near enough.

Fixed amounts on variable income are always either too much or too little. We wrote a full comparison of the two approaches in PayDay vs bank automatic transfers, but the short version is that the only thing that works on lumpy income is a percentage, applied at the moment the money arrives.

The four buckets

Every payment that lands gets carved up the same way. Four accounts, four percentages, no decisions.

Picking your tax percentage

Do not guess a round number. Work it back from the rate bands. Inland Revenue's individual income tax rates from 1 April 2025 are:

Source: Inland Revenue, tax rates for individuals. These rates are stepped, so you do not pay the top rate on everything you earn. That is why your effective rate for the year is lower than the band you finish in.

Two practical points. First, set aside on money received, not on profit you have worked out later, because the only reliable moment to move money is when it arrives. Second, err high. A tax bucket that overshoots gives you a surplus. One that undershoots gives you a problem you have to borrow your way out of. Your accountant can tell you what percentage suits your actual expense profile.

The GST bucket and the $60,000 line

Inland Revenue requires you to register for GST if you carry out a taxable activity and your turnover was at least $60,000 in the last 12 months, or you expect it will be at least $60,000 in the next 12 months. You also must register if you add GST to your prices (Inland Revenue, registering for GST).

Once you are registered, the GST portion of every payment belongs in its own account from soon after it lands. You will usually end up with more in there than you owe, because you claim GST back on what you spend on materials and tools. That surplus is a good problem. Work out what it is when you file, then move it, rather than dipping into the account through the quarter and hoping.

Provisional tax, and the first-year trap

Provisional tax is how Inland Revenue spreads your income tax across the year. You will have to pay it if you had to pay more than $5,000 in tax at the end of the year from your last return, and it is paid in instalments during the year rather than as a lump sum at the end of it (Inland Revenue, provisional tax).

The trap catches people in their first year on the tools for themselves. Inland Revenue says that if you use the standard, estimation or ratio options you will not need to pay provisional tax during your first year in business. That sounds like a free year. It is not. Income tax from your first year is usually due by 7 February the following year, or 7 April if you have an agent, and that can land at the same time as provisional tax for your second year (Inland Revenue, paying tax in your first year in business).

Two bills, one week, in your second year. The tradies who get flattened by that are the ones who treated year one as tax free.

There is also an early payment discount for people who pay voluntarily before their first bill is due. Inland Revenue lists the early payment discount rate for the 2027 income year as 4.25%, with conditions attached, including that you get most of your income from the business and have no provisional tax obligation that year (same source). If your tax bucket is sitting there anyway, it is worth asking your accountant whether you qualify.

Paying yourself a wage instead of living off the business account

This is the change that makes the biggest difference to how life actually feels. Stop spending straight out of the account the jobs get paid into. Pay yourself a flat weekly figure into a separate personal account and live off that.

Set the figure off your worst months, not your best. Look back at the last year, find the three leanest months, and set a weekly wage you could still have paid yourself through them. It will feel low. That is the point. The surplus from the good months piles up in the buffer instead of evaporating, and the lean months stop being an event.

This is the one place a fixed amount is the right tool, because the whole purpose is that it does not move. The percentage split fills the account. The fixed weekly wage empties it at a steady rate. There is more on structuring this in our guide to budgeting on a variable income in NZ.

Surviving the client who pays late

Every tradie has a story about a job that finished in October and got paid in January. Chasing helps, and you should. Invoice the day the work is done, take deposits on anything with a material bill attached, bill progress payments on long jobs, and follow up on a schedule rather than when you remember.

But the real protection is the buffer. A late payer is an inconvenience if you have eight weeks of fixed costs sitting in an account. It is a crisis if you were relying on that invoice to cover this month's mortgage. Work out what your fixed costs actually are for a month, then aim to hold a multiple of that. Our guide on how much emergency fund you need in NZ walks through sizing it.

And when it gets tight, the tax bucket is still not available. Borrowing from it just moves the crisis to February.

Separating the business money from your money

You do not need a company to separate your money. A sole trader with two bank accounts and a habit is ahead of a company owner running everything through one.

Money should flow in one direction. Client payments land in the business account. Out of that account go tax, GST, your wage, and the buffer. Materials, fuel and tools get paid from the business account too, so they show up cleanly in the records. Your personal spending happens only from your personal account, funded by the wage.

It sounds fussy until the accountant's bill comes in lower. For the mechanics of moving money between accounts automatically, see how to split your pay into multiple accounts in NZ.

KiwiSaver, when nobody is paying it for you

An employee gets a compulsory employer contribution of a minimum of 3.5% of their before-tax pay. Self-employed, nobody pays that for you. But the government contribution is still there. Inland Revenue says the government will contribute up to $260.72 each year, and to get all of it you must have contributed at least $1,042.86 between 1 July and 30 June. Contribute less and the government still adds 25 cents for every dollar you save. There is an income cap of $180,000 (Inland Revenue, KiwiSaver benefits).

Nobody is going to remember to move $1,042.86 by the end of June. A small slice off every payment gets there without anyone thinking about it. If you are weighing KiwiSaver against keeping the money accessible, which matters more when your income is lumpy, we compared the two in KiwiSaver vs personal savings.

Making it happen without you

Everything above works on paper. It fails in practice because it relies on you doing manual transfers at the end of a twelve-hour day, on a phone with dust on the screen. One missed week becomes three, and the system is gone.

That is the problem PayDay is built for. You set the percentages once. When a payment lands in your account, the split runs automatically, and it runs on whatever the payment actually was. A $2,400 job and an $18,000 progress claim get the same treatment with no maths from you.

PayDay uses Akahu, New Zealand's open finance platform, to connect to your bank. It never sees or stores your bank login details, it can only make the transfers you set up in a split rule, and you can revoke access whenever you want.

PayDay is pre-launch, so nobody is running their jobs through it yet. The waitlist is open. There is more detail on how the splits work for people on invoices and job payments on our contractors and freelancers page.

Where to start this week

The bottom line

Being good with money as a tradie is not about spending less. It is about making sure the money that was never yours leaves your sight before you get used to seeing it, and the money that is yours arrives at a steady rate you can plan around.

Four accounts, four percentages, one flat weekly wage. Set it up once and it handles a record month and a dead month the same way.