Social Security Truth in Budgeting Act of 2005 - Amends title II (Old Age, Survivors and Disability Insurance) of the Social Security Act to prohibit the receipts and disbursements of the Federal Old-Age and Survivors Insurance Trust Fund and the Federal Disability Insurance Trust Fund (Social Security trust funds) from being included in the Federal budget baseline for any fiscal year and from being counted as new budget authority, outlays, receipts, or deficit or surplus for purposes of offsetting any tax decrease or spending increase. Excludes Social Security trust fund receipts and disbursements totals from official Office of Management and Budget and Congressional Budget Office budget pronouncements.