A thermoplastic composition comprising: a polycarbonate, wherein the polycarbonate consists of carbonate repeat units of the formula wherein at least 60 percent of the total number of R 1 groups are aromatic radicals and the balance thereof are aliphatic, alicyclic, or aromatic radicals; a polycarbonate-polysiloxane copolymer; an impact modifier comprising an elastomer-modified graft copolymers comprising (i) an elastomeric polymer substrate having a Tg less than 10°C selected from the group consisting of conjugated diene rubbers, copolymers of a conjugated diene with less than 50 wt.% of a copolymerizable monomer, olefin rubbers, ethylene-vinyl acetate rubbers, elastomeric C 1-8 alkyl (meth)acrylates, elastomeric copolymers of C 1-8 alkyl (meth)acrylates with butadiene and/or styrene, or combinations comprising at least one of the foregoing elastomers, and (ii) a rigid polymeric superstrate grafted to the elastomeric polymer substrate; an inorganic filler, wherein the inorganic filler comprises a combination of talc and wollastonite, or a combination of talc and glass fiber; a phosphorus-containing flame retardant; an alicyclic hydrocarbon resin flow promoter; and an anti-drip agent; wherein the polymer composition has a melt viscosity of 185 Pa•sec or less, when measured at 270°C and 1500 sec-1 in accordance with ISO 11443; wherein a molded sample of the thermoplastic composition is capable of achieving UL94 V0 rating at a thickness of 1.2 mm (± 10%); wherein a 3.2-mm thick molded NII bar comprising the composition has a notched Izod impact strength of 40 to 200 J/m determined in accordance with ASTM D256 at 23°C; wherein the thermoplastic composition has a heat deformation temperature of 85°C or greater when measured at 1.82 MPa on 6.4 mm bars in accordance with ASTM D648; and wherein the thermoplastic composition has a flexural modulus of 3800-8000 MPa when measured using 3.2mm x 12.7mm x 125 mm bars in accordance with ASTM D790. a polycarbonate, wherein the polycarbonate consists of carbonate repeat units of the formula wherein at least 60 percent of the total number of R 1 groups are aromatic radicals and the balance thereof are aliphatic, alicyclic, or aromatic radicals; a polycarbonate-polysiloxane copolymer; an impact modifier comprising an elastomer-modified graft copolymers comprising (i) an elastomeric polymer substrate having a Tg less than 10°C selected from the group consisting of conjugated diene rubbers, copolymers of a conjugated diene with less than 50 wt.% of a copolymerizable monomer, olefin rubbers, ethylene-vinyl acetate rubbers, elastomeric C 1-8 alkyl (meth)acrylates, elastomeric copolymers of C 1-8 alkyl (meth)acrylates with butadiene and/or styrene, or combinations comprising at least one of the foregoing elastomers, and (ii) a rigid polymeric superstrate grafted to the elastomeric polymer substrate; an inorganic filler, wherein the inorganic filler comprises a combination of talc and wollastonite, or a combination of talc and glass fiber; a phosphorus-containing flame retardant; an alicyclic hydrocarbon resin flow promoter; and an anti-drip agent; wherein the polymer composition has a melt viscosity of 185 Pa•sec or less, when measured at 270°C and 1500 sec-1 in accordance with ISO 11443; wherein a molded sample of the thermoplastic composition is capable of achieving UL94 V0 rating at a thickness of 1.2 mm (± 10%); wherein a 3.2-mm thick molded NII bar comprising the composition has a notched Izod impact strength of 40 to 200 J/m determined in accordance with ASTM D256 at 23°C; wherein the thermoplastic composition has a heat deformation temperature of 85°C or greater when measured at 1.82 MPa on 6.4 mm bars in accordance with ASTM D648; and wherein the thermoplastic composition has a flexural modulus of 3800-8000 MPa when measured using 3.2mm x 12.7mm x 125 mm bars in accordance with ASTM D790.