This may correspond to the US IRS Safe Harbor Rule, which is a simplified form of calculating estimated taxes.

We don't have any Spanish context, but the literal translation seems the most obvious choice.

Hi,

This is just a suggestion, but rather than a literal translation, for those not familiar with the Spanish tax system perhaps a descriptive rendering would be preferable. Anyone already familiar with Spanish taxes would already understand what "simplified estimated tax scheme" refers to and the information Andy has provided is quite clear. But perhaps it would be best to somehow reflect that the "régimen de estimación simplificada" is a simplified version of one of the systems ("estimación directa"/"estimación objetiva-módulos") that the self-employed in Spain have for calculating the advance payments they must make to the tax man each quarter.

This is explained briefly here:

If you wish to register yourself on Autonomos, there are certain steps to be taken, as follows:

1. The first thing you should do is obtain your NIE number (see Residency & Tax: Fiscal Identity Numbers).
2. You will need to apply for a Tax Licence for the work activity to be followed. This can be obtained from the SUMA Office in the town where your work activity will be centred, or Town Hall (Ayuntamiento) as appropriate.
3. You will need to complete and present a 037 form, which is stamped by the Tax Office and confirms the method of payment of your taxes. There are two methods of paying tax:

a) You make quarterly VAT and Income Tax Declarations on the “direct estimations method”, which means you have to start double entry system book-keeping, or hire the services of an accountant, or
b) You pay a quarterly fixed income tax & VAT amount under the "modulos" system.

Both systems have their advantages; a) is a good method if you think your custom is going to fluctuate to a significant degree, as income tax & VAT is only paid on your actual profit/earnings.

Modulos payments do not take into consideration whether you have had a good or bad month, as you pay the same fixed amount, even if you have zero income. Also, under the modulos system, there is no need to keep accounts or prepare numbered VAT invoices, etc. On the other hand, once your business is established and turnover increases you may well benefit from having a tax system whose payments were set at a basic level.

http://www.thinkspain.com/hottopics/workinginspain/system.as...

As Andy also indicated, the text to be translated omits vital information: whether the reference is to the "directa" or "objetiva" scheme, but that may be clear from another part of your text.

Hope some of this helps!



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Note added at 16 hrs (2013-01-22 09:00:44 GMT)
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Yes, indeed, as Andy mentioned, there are simplified versions of both the direct and objective systems.