In general. Even though a notice of a lien imposed by section 6321 is filed in accordance with § 301.6323(f)-1, the lien is not valid with respect to a security interest which comes into existence, after tax lien filing, by reason of disbursements made before the 46th day after the date of tax lien filing, or if earlier, before the person making the disbursements has actual notice or knowledge of the tax lien filing, but only if the security interest is—

In property which is subject, at the time of tax lien filing, to the lien imposed by section 6321 and which is covered by the terms of a written agreement entered into before tax lien filing, and

Protected under local law against a judgment lien arising, as of the time of tax lien filing, out of an unsecured obligation.

Examples. The application of this section may be illustrated by the following examples:

On December 1, 1967, an assessment is made against A with respect to his delinquent tax liability. On January 2, 1968, A enters into a written agreement with B whereby B agrees to lend A $10,000 in return for a security interest in certain property owned by A. On January 10, 1968, in accordance with § 301.6323(f)-1 notice of the tax lien affecting the property is filed. On February 1, 1968, B, without actual notice or knowledge of the tax lien filing, disburses the loan to A. Under local law, the security interest arising by reason of the disbursement is entitled to priority over a judgment lien arising January 10, 1968 (the date of tax lien filing) out of an unsecured obligation. Because the disbursement was made before the 46th day after tax lien filing, because the disbursement was made pursuant to a written agreement entered into before tax lien filing, and because the resulting security interest is protected under local law against a judgment lien arising as of the date of tax lien filing out of an unsecured obligation, B's $10,000 security interest has priority over the tax lien.

Assume the same facts as in example 1 except that when B disburses the $10,000 to A on February 10, 1968, B has actual knowledge of the tax lien filing. Because the disbursement was made with actual knowledge of tax lien filing, B's security interest does not have priority over the tax lien even though the disbursement was made before the 46th day after the tax lien filing. Furthermore, B is not protected under § 301.6323(a)-1(a) as a holder of a security interest because he had not parted with money or money's worth prior to the time the notice of tax lien was filed (January 10, 1968) even though he had made a firm commitment to A before that time.