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OnlyTax Zapier integrationAutomate OnlyTax with Zapier.

The OnlyTax Zapier integration is short: 0 triggers, 1 action and 0 searches. That single action, Create Invoice, writes an invoice into OnlyTax from data that lives in another app, so nobody retypes the amounts or the VAT rate.

Beta app Zapier still marks this integration as beta.

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Overview

What the OnlyTax Zapier integration is for

It lets another app create invoices in OnlyTax for you. OnlyTax is a tax and accounting tool aimed at self-employed people and small companies in Spain, and on Zapier it exposes one thing: an action that writes an invoice. It is not a premium app, so it runs on the free plan, and Zapier still lists it as a beta.

Three results people build with that one action. A sales sheet that bills itself: each row you add with a description, a quantity and a unit price becomes an invoice through Create Invoice. A form that closes the loop: a client fills in an order form and the invoice exists before you open your accounting. A shop or booking tool that hands its sales over: every completed order is sent to OnlyTax with its VAT rate, so nothing is retyped.

Now the limits, because they are big. OnlyTax has no trigger, so nothing that happens inside OnlyTax can start a Zap: the Zap always begins in another app. It has no search, so a Zap cannot look up an existing invoice or client before writing. And there is no action to update, send or cancel an invoice: Create Invoice is the whole menu. If you want an outside view of Zapier itself before you commit, the Zapier review and n8n vs Zapier are the places to start.

Vocabulary

Zapier words you will meet here

The page uses a handful of Zapier terms. Here they are in plain language.

Zap
The automation you build on Zapier: one trigger, then one or more actions that run every time that trigger event happens.
Trigger
The event in an app that starts the Zap. For OnlyTax, the trigger always comes from another app, since OnlyTax offers none.
Action
What the Zap does once it has started. Here, the only one available is Create Invoice, which writes an invoice in OnlyTax.
Task
The unit Zapier bills: one action your Zap completes successfully. Each invoice created counts as one task.
Polling trigger
A trigger Zapier checks on a timer, asking the app for new items and keeping only those it has not seen before.
Instant trigger
A trigger the app reports itself, the moment the event happens, so nothing waits for the next check by Zapier.
Filter
A step that lets the Zap go on only when what arrived meets your condition, and stops it otherwise.
Multi-step Zap
Any Zap beyond one trigger and one action. Adding a filter or a second action makes one, and it needs a paid plan.
Cost

What an OnlyTax Zap costs

The trigger, which comes from another app, never costs a task. Each invoice that Create Invoice writes successfully costs one.

  • Tasks per month on Free100
  • Steps per Zap on Free2 (one trigger, one action)
  • Premium appNo, works on Free
  • OnlyTax triggers0

An attempt that fails is not counted against your plan, and checking the source app for new data costs nothing either. The free plan gives 100 tasks a month and unlimited Zaps, each limited to two steps: one trigger, one action. That fits OnlyTax well, since one trigger plus Create Invoice is already a full Zap. Add a filter and it becomes multi-step, which needs a paid plan. How fast the Zap reacts depends on the other app's trigger and your plan.

Connect

Connect your OnlyTax account

  1. 01

    Go to your connections

    Open the Apps page of your Zapier account. A connection is your OnlyTax account linked to Zapier once, then reused by every Zap that writes invoices into it.

  2. 02

    Add OnlyTax

    Click + Add connection, search for OnlyTax by name in the dialog, select it, then click Add connection. You need an existing OnlyTax account for the next part.

  3. 03

    Sign in and grant access

    Log in to OnlyTax in the tab that opens and allow Zapier to access the account. Invoices created by your Zaps then land in that account, so connect the one you actually bill from.

First Zap

Your first Zap: bill each new sale from a sheet

GoalWhen a new sale is added to a spreadsheet and marked as ready, create the matching invoice in OnlyTax.

  1. 01

    Pick the starting app

    Create a Zap and choose the app that holds your sales as the trigger, here a spreadsheet and its new-row event. OnlyTax cannot start a Zap.

  2. 02

    Test with a real sale

    Run the trigger test. Zapier brings back the three most recent rows, so pick a real, complete sale to map the invoice on.

  3. 03

    Hold back unfinished rows

    From the plus icon, add Filter: a value from the row, a text rule, and the word that marks a sale as ready. This step makes the Zap multi-step, so it needs a paid plan.

  4. 04

    Add Create Invoice

    Add OnlyTax with Create Invoice and map Activity Code, Description, Quantity, Unit Price and VAT (%) from the matching columns of the row.

  5. 05

    Test, then publish

    Test the action once and check the invoice that came back in OnlyTax, then click Publish to switch the Zap on for new rows.

Actions

The OnlyTax action on Zapier

OnlyTax gives you 1 action. For each one: what it does for you, when to reach for it, and what to watch out for.

1

Create Invoice

Action

In Zapier“Create an Invoice in the app”

Writes a new invoice into your OnlyTax account from values passed on by earlier steps. Five boxes are required: Activity Code, Description, Quantity, Unit Price and VAT (%). Two optional ones say whether it is a good and whether the operation is VAT-exempt.

When to use it
a consultant who logs each job in a sheet and wants the invoice drafted from that row.
Watch out
an empty required box stops the step, and that failed attempt costs no task.
When it breaks

When an OnlyTax Zap breaks

Zapier attaches no help article to OnlyTax and lists no limit of its own, so the traps below are the general ones, seen through an invoicing Zap.

Since the Zap always starts in another app, most problems show up on that side before they reach OnlyTax. For the general checks, see Zapier troubleshooting.

  • Past sales are not billed

    A Zap only reacts to what happens after it is switched on. Rows or orders that existed before are never turned into invoices; billing them is a separate job.

  • A missing value stops the invoice

    If one of the five required boxes arrives empty, Create Invoice does not go through. That attempt is not counted as a task, but no invoice exists either.

  • A bulk import is held back

    Pasting a large batch of sales at once into the source app can trigger Zapier's flood protection, which holds the items back instead of billing them all.

  • The same sale is not billed twice

    On a polling trigger, Zapier remembers what it has already seen, so a row that already produced an invoice will not start the Zap again.
Need help

Need help automating OnlyTax with Zapier?

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FAQ

OnlyTax Zapier integration: questions

01Is the OnlyTax Zapier integration free?
Yes. OnlyTax is not a premium app, so it works on Zapier's free plan. That plan gives 100 tasks a month and unlimited Zaps, each with two steps: one trigger and one action. A Zap made of another app's trigger plus Create Invoice fits inside that limit. Add a filter or a second action and it becomes multi-step, which needs a paid plan. Zapier currently lists OnlyTax as a beta app.
02How many tasks does creating an OnlyTax invoice use?
One task per invoice created successfully. The trigger, which always comes from another app, never uses a task, and neither does Zapier checking that app for new data. If Create Invoice fails, for instance because a required box is empty, the attempt is not counted. A Zap with a second action would count both actions separately each time it runs, so plan your monthly volume on that basis. On the free plan, that means up to 100 invoices a month.
03Can OnlyTax start a Zap in real time?
No, because OnlyTax has no trigger at all. A Zap that uses it always starts in another app: a spreadsheet, a form, a shop or a payment tool. How quickly the invoice appears depends on that app's trigger. If it is a polling trigger, Zapier checks every 15 minutes on Free, every 2 minutes on Professional, and every minute on Team and Enterprise. An instant trigger runs straight away on every plan.
04What does connecting OnlyTax to Zapier require?
An OnlyTax account, plus access to anything in it you do not own yourself and want the Zap to write to. You add the connection from the Apps page with + Add connection, pick OnlyTax, sign in in the tab that opens and grant Zapier access. The connection is then reused by every Zap that creates invoices, so it is a one-time step per account. Connect the account you really bill from, since every invoice the Zap creates lands there.
05Which fields does Create Invoice require?
Five: Activity Code, Description, Quantity, Unit Price and VAT (%). Two more are optional and tell OnlyTax whether the line is a good and whether the operation is VAT-exempt. The source app has to provide the five required values, either from its own fields or as fixed values typed into the step. If one of them is missing when the Zap runs, no invoice is created, and the run costs no task. A filter placed before the action can hold back incomplete items.
06What if the OnlyTax operation needed is not on Zapier?
Then it does not exist there, and no setting will add it. On Zapier, OnlyTax offers only Create Invoice: no trigger, no search, and no action to edit, send or cancel an invoice. Those steps stay in OnlyTax itself. The useful part a Zap can take over is the creation of the invoice, from data another app already holds, and nothing beyond that. Everything after creation is done by hand in OnlyTax.
07Zapier, Make or n8n for OnlyTax?
Decide on criteria, not on a ranking. On Zapier, OnlyTax gives you one action on the free plan, with 100 tasks a month and two-step Zaps, which suits simple one-sale-one-invoice flows. If you need to react to events inside OnlyTax or look up existing data, Zapier cannot do it with this app. Check whether the other tools offer OnlyTax operations covering those needs before building. Also count how many invoices a month you expect, since each one is a task.
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