Your first 90 days owning a restaurant: what to do when

Short answer: run your first quarter in three clear phases. Days 1 to 30 are for stabilising: do not redesign anything, just get clean data through the POS, a weekly cash rhythm with GST put aside, and five numbers you watch every week. Days 31 to 60 are for systemising: opening and closing checklists, your first real stocktakes, a supplier review, and the marketing engine switched on. Days 61 to 90 are for optimising: your first menu-engineering pass on real sales, labour tuned to the actual demand curve, and a proper quarterly review. Whether you opened new or bought an existing venue, the arc is the same.

The three phases at a glance

The single biggest mistake in the first quarter is doing everything at once. You cannot fix what you cannot yet measure, and in the opening weeks you have almost no reliable data. So the plan moves in order: get the numbers clean and the cash under control, then lock in how the place runs day to day, then use two months of real trading to make the decisions that actually stick. Here is the shape of it.

Days 1 to 30: stabilise

This month is about control, not improvement. Your first job is a clean data baseline: every single sale must ring through the POS in the correct category, because six weeks from now those categories are the only honest record you will have. If half your coffees are going through as “misc” you have thrown away the data you need to run the business. Set your menu up properly once, then hold it.

Second, build the cash rhythm. Do a weekly cash check, reconcile takings to the POS, and sweep your GST into a separate account every week so the first return is a non-event rather than a crisis. Our guide to restaurant cash flow walks through the weekly routine in detail. Third, put the roster you planned next to the roster that actually happened: opening week almost never matches the plan, and the gap is your first real lesson in demand.

Fourth, start watching five numbers every week and write them down: sales versus the same day last week, food cost percentage, labour percentage, average order value, and complaints or refunds. Those five are your dashboard for the whole quarter. The full list and how to read each one lives in our piece on the restaurant KPIs that matter. Above all, resist the urge to fix the menu in week two. You cannot tell signal from opening noise yet, and anything you change now you will probably change back.

Days 31 to 60: systemise

With a month of trading behind you, lock in how the place runs. Get your opening and closing checklists live and actually signed off each shift, so the venue opens the same way whether you are there or not. If you have not built them yet, our opening and closing checklists guide gives you a starting template. This is also the month for your first proper stocktakes and the variance conversation: count what you have, compare it to what the POS says you should have, and chase the gap. A theoretical food cost of 30 percent that comes out at 36 percent on the shelf is roughly six cents of every dollar walking out the door, and now is when you find out why.

Review your supplier terms now that you have 30 days of real volumes. You know what you actually use, so you can negotiate pricing, delivery days and payment terms from evidence instead of guesses. Switch the marketing engine on properly: complete your Google Business Profile, get review asks running after every visit, and make sure your email list is capturing customers so you own the relationship. Finally, make your first staffing calls with a month of evidence behind them, not a gut feeling from week one.

Days 61 to 90: optimise

Now you have enough real data to make decisions that hold. Run your first menu-engineering pass on 60-plus days of sales: sort every dish by popularity and margin into stars, plowhorses, puzzles and dogs, then act. Promote and protect the stars, reprice or re-cost the plowhorses, reposition the puzzles, and cut or fix the dogs. Our guide to menu engineering and pricing shows the full method. Tune labour to the demand curve you can now actually see: roster by daypart to the pattern in your data, not to a flat assumption that every shift is equally busy.

Review your channel mix too. Look at what delivery apps cost you in commission against direct orders through your own storefront, where you keep far more of each sale, and shift the balance where it makes sense. Then run your first quarterly review: rebuild your break-even with actual numbers instead of the projections from your business plan, and set exactly three priorities for the next quarter. Three, not ten. A young business improves fastest when it fixes a few things well rather than everything badly.

If you bought an existing restaurant

Buyers of a going concern follow the exact same arc, with two extra rules for the first month. Do not change the bestsellers: the regulars you paid for came back for specific dishes, and reworking them early quietly destroys the goodwill that was part of the purchase price. And win the inherited team before you optimise them. Spend the first weeks learning how they run service, keep what already works, and earn trust before you introduce new checklists, suppliers or rosters. Our guide to buying an existing restaurant covers the handover in full; if you are opening fresh instead, see how to plan a grand opening.

Common first-quarter traps

• Over-ordering so you “never 86” a dish. That is cash sitting in the walk-in and higher wastage, not a safety net. Order to real usage once you know it.
• Over-rostering for a demand pattern that has not stabilised. Extra bodies feel safe in week one but wreck your labour percentage before you know the real curve.
• Panic discounting a slow Tuesday in week three. One quiet day is noise. Cutting prices trains customers to wait for deals and rarely fixes the actual problem.
• Changing five things at once so nothing is attributable. Move one lever, measure it, then move the next. Otherwise you never learn what worked.
• Ignoring the books until the first GST bill. Sweep GST weekly and reconcile cash weekly, or the tax hiding inside your takings becomes a shock you cannot afford.

Frequently asked questions

What should I change in the first 30 days of owning a restaurant?
As little as possible. The first month is for stabilising, not redesigning. Get every sale ringing through the POS in the right category so your data is clean, set a weekly cash rhythm with GST put aside, compare the roster you planned against what actually happened, and start watching five numbers weekly. You cannot tell a genuine problem from opening-week noise yet, so resist the urge to rework the menu or slash prices until you have real trading history behind you.

What are the five numbers I should track every week when I open?
Sales versus the same day last week, food cost percentage, labour percentage, average order value, and complaints or refunds. Those five tell you almost everything about a young restaurant: whether demand is building, whether your margins are intact, whether staffing matches trade, whether people are spending, and whether quality is holding. Pull them every week from your dashboard and write them down. Trends across four weeks matter far more than any single day, so track consistently before you react to anything.

When can I start changing the menu after opening?
Wait until you have roughly 60 days of sales data, then do a proper menu-engineering pass. Before that, sales figures are dominated by opening curiosity, friends and family, and the local rush to try somewhere new, so they do not reflect steady demand. At the 60-day mark you can sort dishes into stars, plowhorses, puzzles and dogs with confidence and make pricing or placement calls that stick. Changing the menu in week two usually means acting on noise and undoing it later.

I bought an existing restaurant. Should I follow the same plan?
Yes, the same stabilise, systemise, optimise arc applies, with two extra rules. First, do not touch the bestsellers for at least the first month; regulars came back for those dishes and changing them early erodes the goodwill you paid for. Second, win the inherited team before you optimise them. Learn how they run service, keep what works, and earn trust before you introduce checklists, new suppliers or roster changes. Change too much too fast and you lose the customers and staff the business was built on.

How much should I put aside for GST when I first open?
In New Zealand, set aside your GST every week rather than finding it at return time. If you are on the standard 15 percent rate, a simple habit is to move roughly 15 percent of GST-inclusive sales, less the GST on what you have paid out, into a separate account. Many new owners over-order stock, forget the tax sitting inside their takings, and get a shock at the first return. Treat GST as money that was never yours, sweep it weekly, and the bill stops being a crisis.

What is the biggest first-quarter mistake new restaurant owners make?
Changing five things at once so nothing is attributable. When trade feels slow you want to fix the menu, the prices, the roster, the marketing and the layout together, but then you cannot tell what helped and what hurt. The disciplined approach is to stabilise first, systemise your operations, then change one lever at a time and measure it. Close behind that are over-ordering to never run out, over-rostering for demand that has not settled, and ignoring the books until the first GST bill lands.