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The financial institutions must keep the Tax Administration Service (Servicio de AdministraciónTributaria, SAT) duly informed with respect to the taxes not collected for lackof funds or failure of the institution itself. Otherwise they will be jointly and severallyliable with the taxpayer with respect to the uncollected amounts.6.5. Compulsory CollectionIf from the information that the financial institutions provide to the SAT it is found thatthere are tax amounts pending collection, the tax authorities will automatically determinethe corresponding tax liability, give notice to the taxpayer, and grant the taxpayera term of 10 business days to respond, in the understanding that once that periodexpires, the payment and collection of the tax liability plus adjustments for inflation andsurcharges will be ordered.6.6. Crediting, Offsetting, and Refunds (Annual)The IDE paid during the fiscal year can be credited first against the ISR to be paid by thetaxpayer. If the IDE is greater, the difference can be credited against the ISR withheld fromthird parties and, if there is still a difference, it can be offset against the federal taxesowed by the taxpayer pursuant to the Federal Tax Code.If there is still a difference, the taxpayer can request the return of this tax.It is important to specify that the right to a credit will be lost if it is not taken, suchbeing possible with respect to a fiscal year and up to the amount allowed. In addition,the right to a credit is nontransferable with respect to who paid the IDE by either assignmentor merger.135Tax Regime6.7. Crediting, Offsetting and Refunds (Monthly)It is also possible to credit the IDE that has been paid (by collection) in a specific monthagainst the provisional payment of the ISR corresponding to that month.As with the annual tax, if the tax paid in a month is greater than the amount of thecorresponding provisional payment for the ISR, the difference can be credited against theISR withheld from third parties in that month. If there is still a difference, it may be offsetagainst the federal taxes of the taxpayer and, if there is still a balance in the taxpayer’sfavor, the taxpayer may request its refund.In contrast to the case with the fiscal year tax, a refund will only be possible if it is certifiedby a registered public accountant complying with the requirements established bythe SAT according to general rules.