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Change history

Last updated: September 6, 2026

This page records the changes we make to the calculators and to the published content: what was changed, on which page and on what date. We keep it because a calculator that depends on legislation is only as good as its last review, and because a review date is worth little if you cannot see what it covered.

Parameters that depend on regulation are reviewed once a year, when the figures for the new tax and contribution period are published, and additionally whenever a rule changes in the meantime. Each calculator shows its own review date and its sources. Our working method is described in our methodology, and if you spot an error you can report it through the contact page: we correct it and log it here.

Only released changes are listed. Purely cosmetic or internal work is left out.

22 September 2026

  • The content of all thirty calculators was expanded. The ten main ones (income tax, net salary, unemployment benefit, final settlement, self-employed contributions, pension, mortgage, early repayment, VAT and compound interest) now include a second worked example with figures, data tables, the limits of each calculation, the particular cases that cause most confusion, and two additional frequently asked questions.
  • The maths, physics, unit conversion, grade average and DNI letter calculators went from being a tool with a short explanation to including step-by-step solved exercises, common mistakes and the context of each method.
  • The blog was reorganised: the twenty-nine articles, many of them short and overlapping, were merged into fifteen longer guides. The addresses of the absorbed articles redirect to the guide that now contains them, so no previous link is broken.
  • The English calculators now have translated addresses (for example, /en/calculators/finance/net-salary instead of the Spanish identifier). The previous addresses redirect to the new ones.
  • Ads were removed from the category landing pages, which are navigation rather than content.
  • The link between the DNI letter article and its calculator was fixed; it was missing because the article was registered under the wrong category.

6 September 2026

  • This change history page was published, so that every revision is recorded with its date and its scope.
  • Methodology: the editorial process was spelled out — how a source is chosen, how a figure is verified before publication, what happens when the rules change and how an error is corrected — and the review cadence was stated: annual, plus whenever a rule changes.
  • About: the scope of the CT editorial signature was clarified, setting out what it signs (the writing, the arithmetic and the sourcing) and what it does not (professional advice), and pointing to the owner identified in the legal notice.
  • Early mortgage repayment: the fee note was corrected, as it contradicted the page's own FAQ. Law 5/2019 sets two alternative regimes — 0.25% if repayment happens within the first three years, or 0.15% if within the first five — rather than a scale of 0.15% for years 1 to 3 and 0.25% for years 4 and 5, as previously stated. It now also notes that the fee is zero once the agreed period has passed and that the lender may only charge it if it proves an actual financial loss.
  • A review date and sources were added to the mortgage, compound interest, rent-versus-buy and early repayment calculators.
  • Home renovation: it was made clear that its prices are indicative estimates with no published source to check them against, which is why that page carries no data review date.

5 September 2026

  • APR: the calculator now makes clear that it converts a nominal rate into an effective rate through compounding and does not compute a loan's contractual APR with fees. The Finance category explanation, which credited the APR with costs that legally fall outside it (linked insurance, notary and registry), was corrected.
  • Personal loan: its APR explanation was brought into line with the dedicated calculator.
  • Unemployment benefit: the amount was unified at 70% of the regulatory base for the first 180 days and 60% from day 181, under Royal Decree-Law 2/2024. The tool is now framed around the regulatory base and days contributed rather than salary.
  • Final settlement: the result now separates the settlement itself (holidays and pro-rata bonuses, always owed) from the dismissal indemnity, which applies only depending on the reason for termination.
  • Self-employed: the official source was placed next to the figures, along with a note that the final contribution depends on the later reconciliation. The flat rate is no longer given as a single figure, since the MEI applies to the contribution base.
  • The 2026 parameters used by the calculators were checked against official sources: IPREM, minimum wage, maximum and minimum pensions, self-employed contribution brackets and bases, income tax scale, VAT rates and employee contributions.
  • A review date and a source link were added to twelve finance, work and health calculators.
  • Health: the wording in BMI, hydration and heart rate was revised to describe indicators rather than judge the person, and the source of each methodology was cited (WHO, EFSA, Mifflin-St Jeor and Tanaka et al.).
  • Car costs: the €0.35/km threshold was removed as a marker of high cost, being an arbitrary rule that depends on the vehicle, its financing and the distance driven.
  • Pension: the page now warns that the calculation methodology varies with the retirement year and the applicable rules.
  • Home renovation: the scope, period and provenance of the reference prices were spelled out.
  • SEO: the x-default hreflang, which pointed at the English version on every page, was corrected, and that tag was added to the sitemap. Calculators whose data depend on Spanish regulation are identified as such in the English version.
  • Performance: the blog prose was split out of the main bundle, so opening a calculator downloads less code.

4 September 2026

  • The finance and health blog articles were rewritten to tighten claims and add missing nuance.
  • Sources were added to the health calculators, along with FAQ structured data.
  • The About and Methodology pages were published, with methodology split into a page of its own.
  • Notices, sources and claims were tightened across the finance, home, work and education calculators.

24 July 2026

  • The canonical tag, hreflang and sitemap were aligned with the URL actually served, which carries a trailing slash.
  • The site was renamed to thecalculator.tech.

22 July 2026

  • Blog prerendering was fixed: sixty sitemap URLs were not being generated.
  • The FAQs were made visible to crawlers and the category pages were expanded.
  • The editorial content of the calculators that were still too brief was expanded.