Posts

Compound interest explained with real examples: the snowball of savings

July 15, 2026

Imagine two people. The first starts saving and investing early, with modest amounts, doing so consistently over many years. The second waits longer, saves twice as much each month, but only for half the period. In the end, the first person accumulates more, even though they contributed far less money in total.

That result seems counter-intuitive. How can someone who puts in less end up with more? The answer is compound interest: the mechanism that makes time, not the amount, the most valuable financial asset of all.

Fixed or variable mortgage: how to decide without being caught out by the Euribor

July 9, 2026

Choosing between a fixed and variable mortgage is one of the most important financial decisions most people make. Not because it is technically complicated, but because the consequences extend over decades and the interest rate environment changes constantly throughout that time.

The good news is that there is no universally correct answer. There is, however, a way of thinking through the decision that lets anyone make it with confidence, without needing to be an economist.

How to maximise your self-employed pension: contribute the maximum, or invest the difference?

July 2, 2026

As an autónomo (self-employed worker) you get to choose (within limits) how much you contribute each month. And that raises a question almost nobody answers with real numbers: is it better to push hard and contribute on a high base from now to collect a bigger pension, or to contribute the minimum, invest what I save, and raise my base only at the end?

This isn’t a matter of faith. It depends on how the pension is calculated, and once you understand that mechanism you discover something that changes the whole strategy: most of your contributing life doesn’t count towards the amount of your pension. Let’s see why, and at the end we’ll show you a free calculator to test it with your own figures.

Self-employed contribution by real income: how it's calculated and what to pay each month

June 29, 2026

If you’re self-employed in Spain, your Social Security contribution is one of the most significant fixed costs of your activity. What you might not fully understand is how it’s calculated: why it can change from one year to the next, what it has to do with your invoicing, and why an unexpected adjustment letter sometimes arrives.

The answer lies in the contribution system based on real income, which links your monthly contribution to what you actually earn as a self-employed worker — not a freely chosen base. Understanding how it works is the key to paying the right amount every month and avoiding surprises at the end of the year.

What is net worth and how to calculate yours

June 26, 2026

Your current account balance tells you how much money you have right now. Your net worth tells you how much you’re worth financially. Those are two very different numbers, and the second one is far more useful for making decisions.

You might have 5,000 euros in the bank and an 80,000-euro mortgage, a car loan, and two credit cards with outstanding balances. Your balance looks reasonable; your net worth is probably negative. Or you might have almost nothing in your current account because all your savings are in an investment fund and a Treasury bill. Your balance looks worrying; your net worth is actually solid.

What's new in Cuéntamo: net worth, advanced forecasting, investments and income tax

June 24, 2026

An accounting app isn’t a social network: if things are going well, you don’t need to open it every day. But over the last few months Cuéntamo has changed enough to deserve a proper look. And almost everything new has something in common: it solves something you used to do by hand, in a spreadsheet, or by checking four different places.

More than a list of features, this is a tour of what problem each new thing solves. By section.

A Year Without a Gestoría: What You Learn Doing Your Own Bookkeeping as a Freelancer

May 30, 2026

Last June, a freelancer we know told his gestoría (a tax/accounting firm) he wasn’t renewing. He’d spent four years paying 150 euros a month for a service that consisted of: he sent them the invoices, they filed four returns a year, and if he asked something they answered in 48 hours in a language that needed translation.

Eighteen hundred euros a year. For four quarterly forms and an income tax return. It’s not that they did it badly. It’s that he didn’t feel it was worth what it cost.

I Bill 40,000 Euros a Year as a Freelancer: This Is What I Actually Keep

May 28, 2026

When someone asks how much you earn as an autónomo (a self-employed worker / freelancer) and you say “I bill forty thousand a year”, the next question should be: “yeah, but how much do you actually keep”. Because between billing forty thousand and having forty thousand in your pocket there’s a chasm that only those who live it understand.

This article is the complete, real breakdown of a freelancer who bills 40,000 gross euros a year. No tricks, no optimism, nothing hidden. The whole calculation, from the first euro that comes in to the last one left available to live on.

From 80 to 400 euros a month: how to prepare your finances for when the tarifa plana ends

May 26, 2026

When you registered as an autónomo (self-employed worker), the tarifa plana (the reduced flat-rate Social Security contribution for new freelancers) was probably the best news in the whole process. Eighty euros a month for your Social Security contribution. Nothing. A huge relief in the first few months, when income is still on its way and every euro counts.

The problem is what comes afterwards. Because the tarifa plana ends. And when it ends, it doesn’t go up a little: it multiplies by four or five all at once. And it coincides precisely with the moment when many autónomos start to have real income, so the blow gets mixed up with the first sizeable quarterly IVA (VAT) and IRPF (personal income tax) payments.

Couple finances: one freelancer, one salaried employee

May 24, 2026

She gets paid on the 28th of every month. Always the same amount, give or take. He invoices when he gets paid, which is sometimes the 5th, sometimes the 20th, and sometimes not even that month. She knows exactly how much she’ll earn in July. He has no idea how much will come in over the next three weeks.

If this sounds familiar, you’re not alone. It’s one of the most common household setups, and if you don’t design a financial system that absorbs that asymmetry, the asymmetry turns into arguments.

I've received the contribution adjustment letter: what do I do now

May 22, 2026

If you’re an autónomo (self-employed worker) and you’ve received a letter from the Tesorería General de la Seguridad Social (the Spanish Social Security treasury) with an amount you weren’t expecting, take a breath. You’re not alone and it’s not a fine. It’s the contribution adjustment (regularización de cuotas), a new process that affects all self-employed workers since the system of contribution by real income came into force.

This guide explains what that letter means, how the difference they’re claiming from you (or that they owe you) is calculated, and above all how to stop it catching you off guard again next year.

Depreciation for autónomos: what it is, the official tables and worked examples

May 20, 2026

You’ve just bought a 2,000-euro laptop for your work as an autónomo (self-employed worker). You have the invoice, the IVA (VAT) is clear, and you assume you’ll deduct the whole thing this year like any other expense. But no: that laptop is a capital asset, and for tax purposes it doesn’t work like that.

What you have to do is depreciate it. Spread its cost over several years, following the tables published by the Spanish Tax Agency (Agencia Tributaria). The concept isn’t complicated, but it has its nuances. Let’s break them down.

Your first quarter as an autónomo: a fiscal survival guide

May 18, 2026

Nobody explains this to you when you register as an autónomo (self-employed worker). They tell you to fill in the modelo 036 or 037, to sign up for the RETA (the self-employed Social Security scheme), to take advantage of the tarifa plana (the flat-rate Social Security contribution for new freelancers) if you can, and little else. Three months later your first quarterly return arrives and the question is always the same: “And now, what exactly do I do?”.

VAT to offset from previous quarters: what it is and how it works

May 16, 2026

When an autónomo (self-employed worker) files the modelo 303 (the quarterly VAT return), the result of the settlement can be positive or negative. If it’s positive, you pay it to the Spanish Tax Agency (Agencia Tributaria). But if it’s negative –you’ve paid more VAT than you’ve collected– that balance doesn’t disappear: it’s carried forward to the next quarter to offset it. And if you reach the end of the year with an accumulated negative balance, you can ask for it to be refunded.

Modelo 303 with no activity: how to file it when you haven't invoiced

May 14, 2026

There are quarters when not a single invoice comes in. A bad month that drags on, a lull between projects, the start of an activity where you still haven’t closed your first client. And when the day comes to file your modelo 303 (the quarterly VAT return), the question is unavoidable: if I haven’t invoiced anything, do I still have to file it?

The short answer: yes. As long as you’re registered in the census of economic activities (modelo 036 or 037), the obligation to file the modelo 303 exists every quarter, with or without income.

The autónomo tax calendar 2026: every deadline and every model

May 12, 2026

If you’re an autónomo (self-employed worker), the tax calendar isn’t something you can leave for “whenever I remember”. Every quarter you have obligations with the Spanish Tax Agency (Agencia Tributaria), and the deadlines are firm. Missing a date, even by a single day, means surcharges and late-payment interest that are perfectly avoidable if you have the dates clear.

This article is a quick-reference cheat sheet. Save it to your favourites and check it every time the quarter close approaches.

What happens if you file your quarterly taxes late

May 10, 2026

How to fill in the modelo 303 step by step (a practical guide for autónomos)

May 8, 2026

How your investments are taxed in Spain: a practical IRPF guide

May 6, 2026

One of the questions that comes up most when someone starts investing is: and how do I declare this? The short answer is that the Spanish Tax Agency (Agencia Tributaria) wants its share of what you earn by investing. The long answer is that the system has its nuances, and knowing them can save you quite a bit of money.

This article explains in a practical way how the main investment products are taxed in Spain, without beating around the bush and without claiming to replace a tax adviser.

How to Start Investing from Scratch (Even If You Know Nothing About the Stock Market)

May 3, 2026

Investing feels a little daunting at first. Some people put it off for years because it seems too complicated, too risky, or too much of a “rich person’s game”. Meanwhile, their money has been quietly losing purchasing power sitting in a current account.

This article is for that person. No unnecessary jargon, no promises of magical returns, and no hidden sales pitch.

Why invest if I already have savings?

Because money sitting idle in a current account loses value over time. If inflation runs at 3% a year and your savings earn nothing, in ten years your purchasing power will have dropped significantly, even though the number in your account stays the same.

Deductible expenses for the self-employed under simplified direct assessment: the complete list

April 30, 2026

One of the advantages of being self-employed (autónomo) compared with an employee is that you can deduct the expenses necessary to carry out your activity before being taxed. That reduces the taxable base and, therefore, what you pay in IRPF (Spanish personal income tax).

But “expenses necessary for the activity” has a specific definition in tax law, and not everything that might seem deductible actually is. This guide gathers the most common deductible expenses under simplified direct assessment (estimación directa simplificada), with the nuances worth knowing.

How to Tell if a Savings Account Really Delivers What It Promises: Understanding APY vs. Nominal Interest

April 30, 2026

When a bank advertises a savings account at “4% interest,” that 4% is almost never what you actually earn on your money over a year. Or rather: it depends on what kind of interest rate that 4% is.

The confusion between the nominal interest rate and the annual percentage yield (APY) is one of the most common pitfalls in personal finance, and the one banks exploit the most in their advertising. Understanding the difference doesn’t require an economics degree; it just takes someone explaining it clearly once.

Quarterly IRPF for the self-employed: what modelo 130 is and when you don't have to file it

April 30, 2026

How to manage household finances as a couple without it becoming a source of conflict

April 29, 2026

Managing money as a couple is one of those topics many people avoid discussing openly, precisely because it feels awkward. And that awkwardness has a cost: decisions made without shared information, misunderstandings about who pays for what, and a vague feeling that “something doesn’t add up” that nobody quite puts into words.

Money doesn’t have to be a source of conflict in a relationship. It becomes one when there’s no agreed-upon system and each person’s expectations aren’t aligned. When there’s a system both of you understand and accept, it becomes just another topic, no more loaded than deciding who’s doing the grocery shopping this week.

Emergency fund: how much do you need and how to calculate it based on your real expenses

April 25, 2026

The emergency fund is one of the most repeated concepts in any personal finance conversation. And for good reason: it’s the first real step toward financial stability, the cushion that turns an unexpected event into an inconvenience rather than a crisis.

The problem is that most explanations out there about emergency funds are too generic. “Save three to six months of expenses” is reasonable advice, but not very helpful if you don’t know exactly how much you spend or what to include in that calculation.

What Input and Output VAT Are, Explained Without the Jargon

April 22, 2026

If you’ve just registered as an autónomo (self-employed worker), or you’ve only been one for a short while, there are two terms that come up constantly and that are worth understanding well from the start: IVA soportado (input VAT) and IVA repercutido (output VAT).

They’re not difficult concepts. They’re difficult to understand when they’re explained in technical language before they have any context. With a concrete example, they fall into place on their own.

How to Calculate Your Quarterly VAT Without an Accountant

April 18, 2026

The modelo 303 (the quarterly VAT return) is the form you use to declare VAT every quarter. For many autónomos (self-employed workers) it’s the first tax obligation they face, and also the one that causes the most confusion at first. Not because it’s especially complex, but because nobody explains exactly what you need to fill it in or how the calculation works underneath.

The good news is that the calculation itself is simple. The tricky part, if there’s anything tricky at all, is having your data well organized before you sit down to fill it in.

Why I Stopped Using Excel for My Finances (And What I Actually Needed)

April 15, 2026

For several years, I managed my finances in Excel. It wasn’t just any spreadsheet: I’d invested time building it, it had formulas that worked, neatly organized categories, color coding. At the time, it was exactly what I needed.

Until it wasn’t.

It wasn’t a dramatic moment. It was an accumulation of small frictions that, over time, turned the spreadsheet from a useful tool into something I avoided opening.

The first problem: recurring expenses

The specific point where I started noticing things weren’t working was with recurring expenses and future projections.

Recurring household expenses: how to find out what you really spend each month

April 11, 2026

The Mandatory Record Books for Autónomos in Estimación Directa Simplificada (and How to Stay Sane With Them)

April 8, 2026

If you’re an autónomo (self-employed worker) under the estimación directa simplificada regime (simplified direct assessment), the Spanish Tax Agency (Agencia Tributaria) requires you to keep four record books of your economic activity. They’re not optional, and they’re not meant to be tucked away in a drawer. They’re documents that the Agencia Tributaria can request at any time, and they have to be filled in correctly.

That said: keeping them doesn’t have to be complicated. The usual problem isn’t technical complexity but not knowing what goes into each one, or letting months pile up without updating them. That’s what turns something manageable into chaos.

Personal finances and freelance work in the same bank account: the mistake that costs you money and time

April 4, 2026

When someone starts freelancing for the first time, there’s a decision almost nobody makes consciously: whether to open a separate bank account for business, or just use the one they already have.

Most people go with the second option. It’s the easiest thing to do. Just to get started, to try things out, to keep it simple. And for the first few months, it works well enough.

The problem comes later. When it’s time to file your quarterly taxes, when your accountant asks for invoices, when you try to figure out how much money you’re actually making as a freelancer. That’s when having everything mixed together turns into a financial archaeology project nobody enjoys.

How Much Money Will I Have in Three Months? How to Build a Cash Flow Forecast as a Freelancer

April 1, 2026

There’s one question every freelancer should be able to answer in under thirty seconds: how much money will I have in my account three months from now?

If it takes you longer, or if the answer is “I have no idea,” you have a visibility problem. Not necessarily a money problem, but an information problem. And that distinction matters a lot.

A cash flow forecast isn’t accounting. It’s not for the Spanish Tax Agency (Agencia Tributaria). It’s for you: to know whether you can afford that expense, whether you’ll sail comfortably through the end of the quarter, or whether there’s a rough month on the horizon you’d better prepare for.