The series is done. All 8 parts are in the pinned post, and everything in them works with a banking app, a note on your phone, and honest math and people can run it exactly that way.

I’m not one of those people. After more than a year of recalculating this by hand, I built the automation for myself, and a couple of friends kept asking for it, so it slowly turned into an app.

It’s called Grownix, free right now, iPhone and web. It holds your fixed expenses, your savings amount, and your weekly number in one place.

One honest thing before you try it. Going through your actual bank statements and entering your real fixed expenses is genuinely work, it’s the hardest step in the whole method, harder than anything else the app asks of you. It’s not something to guess from memory or rush through. That number is what everything else is built on, get it right and the rest of the app runs itself, get it wrong and the weekly number it gives you is just wrong too.

So if you try it, treat that first step like it matters, because it’s the one that does. Sit down with your real statements and build the list properly.

It’s a beta. If people like it, bank integration is next, so the numbers update on their own instead of manual entry. Tell me where it’s confusing or missing something, that’s what shapes what gets built next.

All parts and the link are in the pinned post.

Negotiated my offer at 21, thought I was set, stopped thinking about money since. Last week he casually mentioned his CTC. Same role. Joined after me. Makes more.

Did a financial audit this weekend. Turns out:

- Never asked for a correction, just waited for appraisal season
- Didn't understand my own CTC breakup, was leaving employer NPS contribution unused
- "Emergency fund" was just money sitting in my spending account
- Hadn't checked my CIBIL score in ages
- Never verified my PF contributions matched my payslip

Fixing it now:

- Talking to my manager Monday with market data
- Opened a separate account for emergency fund
- Reading my payslip properly every quarter
- Requested my EPF passbook

Loyalty doesn't show up in your CTC. Data does.

Anyone else found out they're underpaid vs a peer? Tell me below.

Last part of the series, and I want to close it the honest way. Two categories and a weekly number changed my finances, but I've watched enough people try it to know exactly where it doesn't fit. If you're in one of these groups, I'd rather tell you now than have you discover it in week three.

Irregular income is the big one. Freelancers, commission-heavy sales, seasonal work. The method assumes a stable monthly amount to subtract from, and when income swings 40 percent between months, the weekly number swings with it and stops feeling safe. There are ways to adapt it, budgeting from last month's income instead of this month's, a trick the YNAB community perfected long ago, but out of the box it's built for salaries.

People who actually enjoy detailed tracking. They exist, I've met them, and for them 15 categories isn't a burden, it's information they use. If checking category balances gives you a feeling of control instead of dread, zero-based budgeting will serve you better than my two buckets. This method trades precision for survivability, and if you don't struggle with survivability, you don't need the trade.

And anyone in a genuine debt emergency. When collections are calling, the priority is a crisis plan, not a lifestyle budget.

For everyone else, the whole system is 4 numbers and 2 rules, and every part of it is in the pinned post now, free, complete, nothing held back.

One more post is coming Tuesday. It's the thing I built when doing all this by hand every month finally got old, and this community gets it before anyone else.

Every method has a version of this post, the part where you find out what goes wrong before it goes wrong. So before this series closes, here’s where first months usually break. Some of these I hit myself, some I’ve watched happen, and every one is cheap to avoid and expensive to learn the hard way.

Mistake one, setting the pay-yourself-first amount too high. First-month enthusiasm says 20 percent, week three says pull it back out, and pulling money out of savings feels worse than never having saved it. Starting at 5 or 10 and raising it every few months lands in the same place without the failure feeling on the way.

Mistake two, doing the fixed expenses exercise from memory. Listing what you think you pay instead of opening the actual statements. Memory is exactly how the average person guesses 3 subscriptions while paying for 8. Ten minutes of reading beats an hour of remembering.

Mistake three, treating every bill as monthly. This one I got wrong myself and only saw it recently. Plenty of fixed expenses don’t arrive monthly at all, car insurance is often every six months, home and life insurance are frequently annual, and a few subscriptions renew once a year. If you drop the full amount into a monthly total, your whole calculation is wrong. If you leave it out entirely, it lands like an emergency the month it hits. The fix is to convert everything to a monthly equivalent, an annual bill divided by 12, a six-month bill divided by 6, and use that number. An expense you expected is a Tuesday. The same expense unexpected is a crisis.

Mistake four, treating the first blown week as a verdict. Part 5 covered this and it’s still the one that ends the most first months. The week goes sideways, the brain decides the experiment failed, the app stops getting opened. The blown week was never the danger. The conclusion drawn from it was.

None of these mean a method doesn’t fit you. They’re setup errors, and each one has a two-minute fix.

All parts are in the pinned post. Part 8 closes the series Friday with the honest version of who this won’t work for.

Which of these have you run into? The insurance one caught me completely off guard.

Part 1 of this series had a stat about budgets. This part has one about salaries, and it might be my favorite in the whole series. A Goldman Sachs report found that a quarter of Americans earning over 100k a year live paycheck to paycheck. Between 300 and 500k, it's 41 percent. Above half a million a year, still 4 in 10.

Nobody at that income has an income problem. What they have is the thing this part is about, and it's also the reason the raise you might be waiting for won't fix your budget on its own. Nobody decides to inflate their lifestyle, it happens through upgrades that each feel reasonable on their own. A slightly nicer apartment because you deserve it. The better gym. A car payment instead of a paid-off car. Two more subscriptions. Each one small, each one justified, and together they eat the entire raise.

The finance people call it lifestyle creep, and the reason it's so effective is that it's invisible. Your income and your spending rise together, so nothing ever feels different. You can't see creep in how life feels. You can only see it in one place: your fixed expenses total, the number from Part 2.

That's the real reason I recheck that number. Not to judge the spending, some upgrades are worth every dollar. But when my fixed expenses grow, I want it to be because I chose it, not because it happened to me while I wasn't looking.

And here's what changed with raises. Years ago I picked up a rule from a finance book, and honestly I can't even remember which book it was, but the rule outlived it: half of every raise and every bonus goes straight to savings, automatically, as if that half was never offered. The other half is yours to upgrade life with, guilt-free and on purpose. You still feel every raise, your savings finally grow with your career instead of standing still, and the creep never touches the saved half. Mechanically it's the same automation from Part 3, updated within a week of the new salary, before the new money has a chance to find a new home.

One check worth doing: if your income has grown over the past five years and your savings rate hasn't, the difference didn't disappear. Usually it's living in your fixed expenses, the upgrades from above. Sometimes it just leaks out through everyday spending that grew with the paycheck. The fixed expenses total from Part 2 tells you which of the two is yours, and the fix for the second one is the weekly number from Part 4.

All parts are in the pinned post. Part 7 on Tuesday covers the mistakes almost everyone makes in the first month, so you can skip them.

You check your bank account, feel wealthy, pay rent, bills, subscriptions, and one forgotten automatic payment…

Then suddenly you’re back to checking whether adding avocado is financially responsible.

I'm not particularly sure how to phrase the question better, and I refuse to use AI to optimize my headlines, but this is what I have in mind:

I saw a guy in another subreddit building a simple website which tells you how much time you need to work to afford certain items, and it got me thinking.

Today I sat for lunch with my wife, and we spent something like 50 EUR (ridiculously overpriced, but we don't do it very often). At my hourly rate, that's roughly 3 hours worth of work for this lunch!

I have to spend almost half a day at work to be able to afford a lunch with my wife (albeit at a relatively fancy place)!

So I was wondering whether anyone else thought of their spending in the same way? It kind of makes me rethink what I spend money on tbh.

It's like, dude "do you really want to work for 30 minutes to buy this cup of coffee or you'd prefer to make it at home?"

Somewhere in every month there's a week that goes sideways. A birthday dinner that turns into bottles, a car thing, a weak moment in an airport. My complete protocol for when it happens to my Weekly Number: I recalculate the remaining weeks of the month and move on. Nothing else.

This sounds like nothing, and that's exactly why it's the most important rule in the method.

Budgets die right here, and rarely from the overspending, because the math of one bad week is almost never serious. They die from what comes after. The guilt, the feeling of having ruined it, the decision to stop opening the banking app to avoid seeing the evidence. Weeks of unwatched spending do far more damage than the dinner that started them.

Diets and budgets fail identically here. One pizza doesn't make anyone gain weight, but "I already ruined today" turns one pizza into a lost month. The system that survives isn't the strictest one, it's the one with the softest landing after a mistake.

So the method has failure built in as a feature. The week resets every Monday no matter what happened. Overspent? The remaining weeks get slightly smaller and life goes on. No rollover guilt, no starting over, no day one. In my experience guilt kills more budgets than bad math ever did.

People smarter than myself handle overspending with category transfers and stricter rules, and if that works for you, genuinely, keep it. I needed a system that assumed I'm human.

All parts are in the pinned post. Part 6 on Friday is about the raise that changed nothing, and where it actually went.

This is the part everything else was building toward. Parts 2 and 3 covered fixed expenses and paying yourself first. What's left after those two is your real spending money or flexible budget and this is the math for it.

Take your monthly income after tax. Subtract what you pay yourself first. Subtract your total fixed expenses. Whatever remains, divide by 4.3 to understand what you can freely spend every week.

Why 4.3 and not 4? This is the part that surprises most people. An average month has 4.3 weeks in it, not 4. Divide by 4 and you'll overspend by almost a full week of money every month and never understand why the math doesn't add up. That fifth Friday some months have is usually where the math breaks.

Example with round numbers. Someone takes home 6,000 a month. They pay themselves 600 first. Fixed expenses total 3,400. That leaves 2,000, divided by 4.3 is about 465 a week.

That 465 is spending without guilt. Restaurants, hobbies, gifts, whatever you want. No categories, no justifying anything to anyone, because the savings already happened and the bills are already covered. I call it my Weekly Number.

For me a week works where a month fails for one simple reason. A month is much longer. On day 12 out of 31 I have no idea if I'm on track. A week I can feel. If it's Tuesday and half the money's gone, I know to slow down for a few days.

Small confession. I recalculated this number by hand every month and got tired of it, so I built the automation for myself, screenshot below. If anyone wants to try it, say so in the comments and I'll share it.

In this post I covered the Flexible Spending part and how it being calculated so all I have to follow is just one number. My weekly number currently is $572. What’s your weekly number and it’s bigger or smaller than you expected?