The study is devoted to the methodological substantiation of fiscal regulation and management instruments in UK macroeconomic policies. UK fiscal policy of 2010–2023 was analyzed. The result of the study is a methodological substantiation of the main directions of fiscal policy. (1) The public debt problem can be resolved through real fiscal consolidation and lowering rates while maintaining the tax base. (2) The prevention of contradictions between monetary, tax, and budget policies has been justified. An alternative is a possibility and necessity of sequestering budget expenditures to reduce public debt as a matter of priority. (3) Markets show that simultaneous tax and budget shocks are unacceptable instead of coordinating fiscal and monetary policies. (4) Based on regression analysis, interrelations between TTCR and the main macroeconomic indicators of the UK were revealed. Statistically significant dependencies between TTCR and GDP growth, quality of life, and labour productivity were confirmed.