Tax base growth refers to increases in total taxable assessed property value within a municipality, generating additional tax revenue even with stable tax rates. Tax base growth comes from new development (subdivisions, commercial construction), property improvements (renovations, additions), and general market value appreciation captured through reassessment. Tax base growth is important for municipal fiscal sustainability—it provides revenue to accommodate growth-related service demands and offsets inflation without requiring tax rate increases. Municipalities in growing areas benefit from strong tax base growth, while declining or stable communities face pressure to raise rates to maintain revenues. Long-term financial planning incorporates tax base growth assumptions, though actual growth can vary significantly from projections.