BUENOS AIRES--Argentina's federal tax agency stepped up measures against grain exporters it accuses of tax evasion Monday, blocking sales tax rebates to the companies it says owe it hundreds of millions of dollars.

Companies that have debts due to "any tax obligations" are excluded from those authorized to receive the V.A.T. refunds, tax agency Afip said in a resolution published in the official bulletin Monday.

In addition, Afip removed global grain trading firm Bunge Ltd. (BG) from a grain exporter registry, going a step further from the temporary suspension it imposed on Bunge earlier this year for alleged tax fraud, an Afip spokesman said.

Exclusion from the registry means the income tax withheld on domestic grain trading rises to 15% from 2%, as well as the withholding of a 10.5% sales tax. Companies not on the registry also face new, burdensome approval requirements for domestic shipping permits.

The move comes amid a broad government crackdown on alleged tax evasion, with commodities exporters coming under particular scrutiny.

Argentina is the world leader in soymeal and soyoil exports and ranks No. 2 in corn exports and third in soybeans. Soybeans are the country's leading export, and the taxes collected on those shipments are a key source of revenue for the government.

Afip has suspended several of the country's largest grain-trading firms, including Bunge, Molinos Rio de la Plata SA (MOLI.BA), Louis Dreyfus and Oleaginosa Moreno, from the registry on charges of tax evasion.

In 2010, Afip accused the companies of using shell companies in neighboring countries for accounting purposes that left minimal profits on the books of their Argentine units.

Earlier this month, Afip also suspended agriculture biotechnology company Monsanto Co. (MON) from the grain trader registry.

The government said that Monsanto's Argentine unit evaded $70 million of income taxes by borrowing money from Monsanto shell companies in Panama and Bermuda and writing off the interest it paid on those loans to reduce its taxable income.

Monsanto, one of the leading sellers of transgenic corn seeds in Argentina, denied the charges.

Monsanto was initially suspended from the grain registry in January due to tax irregularities, and paid 40 million pesos ($8.5 million) to Afip.

Write to Shane Romig at shane.romig@dowjones.com

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