As the NDL belongs to the Diet, its annual revenues and expenditures are in the national budget. The total amount of the initial budget appropriated for NDL is approximately 20,240 million yen for FY2022 beginning in April 2022.
Approximately 2,380 million yen is allocated for library materials as follows:

Purchases of library materials 772 million yen
Compensations for deposit of publications 397 million yen
Purchases of scientific/technical materials 1,142 million yen
Purchases of materials for legislation 64 million yen

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