Tax for IT contractors

Tax issues in your field

The day you leave a salaried job to contract, your employer stops doing the quiet work that used to be invisible. PAYE, KiwiSaver, ACC and the year-end square-up all happened in the background while you got paid a tidy net amount. As a contractor or freelancer, those become your responsibility, and the most dangerous part is that nothing forces you to deal with them until the bill arrives.

The specific issues for IT contractors and freelancers are: whether your payments are schedular payments with tax withheld at source, choosing a sensible withholding or set-aside rate so you are not caught short, deciding whether to register for GST, claiming the genuine costs of running a one-person tech business, and being ready for provisional tax in your second year. There is also the ACC levy, which arrives as its own invoice and surprises almost every new contractor in their first full year.

The good news is that an IT contracting business is one of the simplest to run cleanly. The income is usually a handful of invoices a month, the expenses are mostly digital, and the whole thing reconciles in minutes if it is set up properly. The contractors who get into trouble are not the ones with complex affairs, they are the ones who treated their gross invoice income as if it were a net salary and spent it all.

GST and your situation

GST registration for a contractor is part rule, part choice. You must register once your turnover passes $60,000 in a 12-month period, and a full-time contractor on a decent day-rate clears that comfortably. Below the threshold, registration is optional. GST is charged at 15%, so once registered you add 15% to your invoices and hand it to Inland Revenue, while claiming back the GST on your business costs.

For many IT contractors the maths is simple: if your clients are GST-registered businesses, the 15% you add is just claimed back by them, so charging it costs them nothing while letting you recover GST on your own laptop, software and home-office costs. That is why a lot of contractors register voluntarily even before they hit the threshold. If your clients are overseas, your services may be zero-rated, which means no 15% is added but the income is still reported and you can still claim input GST, sometimes putting you in a refund position.

The one thing to avoid is registering, charging GST, and then forgetting it is not your money. Set the 15% aside as it lands and the GST return is a non-event.

Deductions specific to you

A one-person tech business has a clean, mostly-digital set of deductible costs. The ones that matter for IT contractors and freelancers:

• Hardware — laptops, monitors, peripherals and phones used for work. Higher-cost items are generally capitalised and depreciated, while low-value items can often be expensed immediately.
• Software and subscriptions — development tools, design apps, cloud hosting, code repositories, AI tools and your accounting software, all deductible operating costs.
• Home office — if you work from home, a reasonable portion of power, internet, and rent or mortgage interest may be claimable on a square-metre basis. Your internet and mobile plans are partly deductible based on business use.
• Professional development — courses, certifications and conferences that maintain or improve your existing skills are generally deductible.
• Insurance — professional indemnity and public liability cover relevant to your work.
• Accounting and professional fees — the cost of having your contracting accounts handled is itself deductible.
• ACC levies — payable as a self-employed person, and a deductible business cost.

The most common miss is the home office and connectivity claim, simply because contractors do not track the business-use portion of their internet, phone and workspace. A modest, well-supported home-office claim is legitimate and adds up across a year. The thing to avoid is the opposite error, claiming personal subscriptions or gear that never touches the business, which is the kind of risk a quick review removes.

Structure and provisional tax

Most contractors start as a sole trader, which is the simplest way to operate. Some payments you receive may be schedular payments, where the payer withholds tax at source before paying you. You can often choose your withholding rate within the allowed range, and picking a realistic rate is the single best way to avoid a year-end shock, because the tax is taken as you earn rather than owed in a lump later. If your work is not subject to schedular withholding, you simply set the money aside yourself.

As income and risk grow, a company structure can make sense. A company taxes profit at a flat 28%, separates the business from your personal assets, and can look more established to enterprise clients who prefer to contract with a company. Whether it is worth the extra admin depends on how much you earn, how much you draw versus retain, and your clients' expectations.

The classic trap is provisional tax in your second year. In year one you pay your income tax in a lump after filing. If your residual income tax tops $5,000, you then move into provisional tax, paying the next year's tax in instalments at the same time as you settle year one. New contractors who spent everything in year one meet this as a genuine cashflow wall. The fixes: set aside a sensible percentage of every invoice from day one, use a realistic schedular withholding rate where it applies, and lean on the safe-harbour rule, which generally protects smaller taxpayers who pay on time under the standard method from use-of-money interest until the final instalment. A simple rule of thumb is to park roughly a third of each invoice for tax, GST and ACC, then adjust once your real numbers are known.

Keeping records simple

Contracting is the easiest kind of business to keep tidy, because the volume is low. The trick is to do the small amount of admin little and often rather than in a panic at year-end. We are Xero-friendly, so if you already invoice through it we can pick up the file and keep your GST, income tax and ACC all aligned.

• Invoice promptly and reconcile your bank monthly; it takes minutes when there are only a few transactions.
• Keep a separate tax account and move a fixed percentage of every payment into it the moment you are paid.
• Photograph or forward digital receipts for hardware, software and home-office costs so the deductions are supported.
• Track the business-use percentage of your phone, internet and workspace once, then apply it consistently.

Fixed fees, no surprises: you will know what it costs to have your contracting accounts handled before we start, so the only invoices in your life are the ones you send to clients.

Book a free review

If you have just gone independent, or you are heading into your second year and bracing for provisional tax, a quick conversation sorts the setup so it runs on autopilot. Book a free 20-minute tax review and we will look at your invoicing, GST position and set-aside rate, and tell you plainly how much to park and when. No obligation.

This is general information only, not personalised tax advice. Your situation may differ, so confirm the detail with us or check ird.govt.nz before you act.

In plain English: as a contractor your gross invoice is not your money, so set aside a third for tax, GST and ACC from day one and the second-year provisional-tax wall never appears.