Planning business cash flow around GST and provisional tax dates

Tax bills rarely come as a surprise. The dates are known, the amounts are broadly predictable, and yet GST and provisional tax are among the most common reasons New Zealand businesses look for urgent funding. Usually, the problem isn’t the tax itself; it’s that the money was spent before the bill arrived.

This guide covers simple ways to plan around tax dates, and when borrowing makes sense if a bill still lands at the wrong time.

Why tax bills catch businesses out

GST is collected from customers as you trade, but paid to IRD later. In a busy period, the GST in your bank account can look like spare cash. By the time the return is due, it’s been spent on stock, wages or equipment.

Provisional tax works similarly. Instalments fall due during the year, often when the business is investing or going through a quieter patch. A strong year can mean a bigger bill than expected, particularly for businesses using the standard method based on the previous year.

Habit one: a separate tax account

The simplest fix is also the most effective. Open a separate bank account and, every time you’re paid, transfer an amount for GST and income tax into it. Many businesses do it weekly; some do it on every invoice.

• For GST, set aside the GST portion of what you’ve been paid, less GST you can claim on expenses.
• For income tax, set aside a percentage your accountant suggests, based on expected profit.

When the return is due, the money is already there.

Habit two: choose the right GST frequency

Depending on your turnover and eligibility, you may be able to file GST monthly, two-monthly or six-monthly. Each suits a different business:

• Monthly keeps each bill smaller and closer to when the money came in, which suits businesses with lumpy cash flow or those claiming refunds regularly.
• Two-monthly is common and balances admin with cash flow.
• Six-monthly reduces admin but means larger bills, which can be risky if GST isn’t set aside.

Your accountant can tell you which options are open to you and how to change.

Habit three: the right provisional tax method

IRD offers several ways to calculate provisional tax, including the standard method based on last year’s tax, an estimation method, and a method that ties payments to GST turnover. Some suit businesses with rising income; others suit businesses with uneven income or those that want payments to track cash flow more closely. Ask your accountant which fits your situation; it can make a real difference to when, and how much, you pay.

Know your dates

Put every GST and provisional tax due date for the year in your calendar, with a reminder two weeks before. Check the balance in your tax account against the expected bill at each reminder. If there’s a shortfall, you have two weeks to act rather than two days.

When borrowing makes sense

Even with good habits, timing can go wrong. A big customer pays late. A large equipment purchase lands in the same month as a GST return. A strong year produces a provisional tax bill bigger than the tax account. In those cases, short-term funding can bridge the gap.

It makes most sense when:

• It’s a one-off timing problem, not a pattern.
• The cost of the loan is lower than IRD’s penalties and interest.
• There’s a clear source of repayment, such as a customer payment or the next months’ trading.

A line of credit set up in advance is ideal for recurring tax-date gaps. A cash flow loan suits a one-off. For larger arrears that have already built up, see IRD tax debt loans.

When borrowing doesn’t make sense

If the business is regularly short at tax time, borrowing just moves the problem. Look at the underlying causes: are prices too low, are costs too high, is too much cash tied up in stock or debtors? Talk to your accountant before taking on debt to pay tax every year.

Talk to IRD early

If you know a payment will be late, contact IRD before the due date. Engaging early can reduce penalties and makes an instalment arrangement more likely. IRD is generally more flexible with businesses that get in touch than with those that go quiet.

An illustrative example

An Invercargill engineering workshop files GST two-monthly and has a strong quarter, invoicing a large mining equipment contract. The GST on that contract is due on the next return, but the customer pays on 60-day terms, so the cash hasn’t arrived when the return is due.

The workshop has a revolving facility set up the year before. It draws $38,000 to pay the GST on time, then repays it when the customer pays three weeks later. The cost is a few weeks’ interest, far less than late payment penalties and interest. Afterwards, the owner talks to the accountant about switching to monthly GST filing to keep future bills closer to when cash arrives.

Put a buffer in place now

The best time to arrange a facility for tax dates is when the business is doing well, not the week the bill is due. The funding speed finder can show what’s realistic for your timing.

Using your accounting software

Most New Zealand businesses use cloud accounting software such as Xero or MYOB, and both can make tax planning much easier. Set up a bank rule or a recurring transfer that moves a set percentage of every deposit into your tax account. Use the GST report to check, at any time, how much GST you’ve collected and how much is likely to be due. Many accountants can also set up a simple dashboard showing your tax account balance against upcoming bills.

If you use a bookkeeper, ask them to flag any period where the tax account is falling behind the expected liability. Catching a shortfall two months out gives you time to adjust spending, chase debtors or arrange a facility on calm terms rather than in a rush. That one habit removes the need for most emergency tax borrowing.

Refunds count too

If your business regularly receives GST refunds, for example because it exports or invests heavily in equipment, filing more often can bring that cash in sooner. Refunds are part of the cash flow picture, and timing them well can reduce how much you ever need to borrow around tax dates.

Ask a real person

Asking what’s possible doesn’t touch your credit file, and we don’t pass your details around a crowd of lenders. A real person reads your enquiry, looks at your tax dates and cash flow, and calls you with an option that fits. Start your enquiry.