SEC. 133. Common Limitations on the Taxing Powers of Local Government Units. - Unless otherwise provided herein, the exercise of the taxing powers of provinces, cities, municipalities, and barangays shall not extend to the levy of the following:
x x x x
(o) Taxes, fees or charges of any kind on the National Government, its agencies and instrumentalities and local government units. x x x.
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When local governments invoke the power to tax on national government instrumentalities, such power is construed strictly against local governments. The rule is that a tax is never presumed and there must be clear language in the law imposing the tax. Any doubt whether a person, article or activity is taxable is resolved against taxation. This rule applies with greater force when local governments seek to tax national government instrumentalities.
Another rule is that a tax exemption is strictly construed against the taxpayer claiming the exemption. However, when Congress grants an exemption to a national government instrumentality from local taxation, such exemption is construed liberally in favor of the national government instrumentality.