Microsoft Excel LibreOffice Calc

Comcast Corp. (CMCSA)

DuPont Analysis: Disaggregation of ROE, ROA, and Net Profit Margin

Beginner level

Decomposing ROE involves expressing net income divided by shareholders’ equity as the product of component ratios.

Two-Component Disaggregation of ROE

Comcast Corp., decomposition of ROE

Microsoft Excel LibreOffice Calc
ROE = ROA × Financial Leverage
Dec 31, 2018 16.38% = 4.66% × 3.51
Dec 31, 2017 33.11% = 12.15% × 2.72
Dec 31, 2016 16.12% = 4.82% × 3.35
Dec 31, 2015 15.62% = 4.90% × 3.19
Dec 31, 2014 15.90% = 5.26% × 3.02

Based on: 10-K (filing date: 2019-01-31), 10-K (filing date: 2018-01-31), 10-K (filing date: 2017-02-03), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-27).

The primary reason for the decrease in return on equity ratio (ROE) over 2018 year is the decrease in profitability measured by return on assets ratio (ROA).

Three-Component Disaggregation of ROE

Comcast Corp., decomposition of ROE

Microsoft Excel LibreOffice Calc
ROE = Net Profit Margin × Asset Turnover × Financial Leverage
Dec 31, 2018 16.38% = 12.41% × 0.38 × 3.51
Dec 31, 2017 33.11% = 26.87% × 0.45 × 2.72
Dec 31, 2016 16.12% = 10.81% × 0.45 × 3.35
Dec 31, 2015 15.62% = 10.96% × 0.45 × 3.19
Dec 31, 2014 15.90% = 12.18% × 0.43 × 3.02

Based on: 10-K (filing date: 2019-01-31), 10-K (filing date: 2018-01-31), 10-K (filing date: 2017-02-03), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-27).

The primary reason for the decrease in return on equity ratio (ROE) over 2018 year is the decrease in profitability measured by net profit margin ratio.

Five-Component Disaggregation of ROE

Comcast Corp., decomposition of ROE

Microsoft Excel LibreOffice Calc
ROE = Tax Burden × Interest Burden × EBIT Margin × Asset Turnover × Financial Leverage
Dec 31, 2018 16.38% = 0.78 × 0.81 × 19.74% × 0.38 × 3.51
Dec 31, 2017 33.11% = 1.50 × 0.83 × 21.56% × 0.45 × 2.72
Dec 31, 2016 16.12% = 0.62 × 0.83 × 21.08% × 0.45 × 3.35
Dec 31, 2015 15.62% = 0.62 × 0.83 × 21.24% × 0.45 × 3.19
Dec 31, 2014 15.90% = 0.68 × 0.82 × 21.62% × 0.43 × 3.02

Based on: 10-K (filing date: 2019-01-31), 10-K (filing date: 2018-01-31), 10-K (filing date: 2017-02-03), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-27).

The primary reason for the decrease in return on equity ratio (ROE) over 2018 year is the decrease in effect of taxes measured by tax burden ratio.

Two-Component Disaggregation of ROA

Comcast Corp., decomposition of ROA

Microsoft Excel LibreOffice Calc
ROA = Net Profit Margin × Asset Turnover
Dec 31, 2018 4.66% = 12.41% × 0.38
Dec 31, 2017 12.15% = 26.87% × 0.45
Dec 31, 2016 4.82% = 10.81% × 0.45
Dec 31, 2015 4.90% = 10.96% × 0.45
Dec 31, 2014 5.26% = 12.18% × 0.43

Based on: 10-K (filing date: 2019-01-31), 10-K (filing date: 2018-01-31), 10-K (filing date: 2017-02-03), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-27).

The primary reason for the decrease in return on assets ratio (ROA) over 2018 year is the decrease in profitability measured by net profit margin ratio.

Four-Component Disaggregation of ROA

Comcast Corp., decomposition of ROA

Microsoft Excel LibreOffice Calc
ROA = Tax Burden × Interest Burden × EBIT Margin × Asset Turnover
Dec 31, 2018 4.66% = 0.78 × 0.81 × 19.74% × 0.38
Dec 31, 2017 12.15% = 1.50 × 0.83 × 21.56% × 0.45
Dec 31, 2016 4.82% = 0.62 × 0.83 × 21.08% × 0.45
Dec 31, 2015 4.90% = 0.62 × 0.83 × 21.24% × 0.45
Dec 31, 2014 5.26% = 0.68 × 0.82 × 21.62% × 0.43

Based on: 10-K (filing date: 2019-01-31), 10-K (filing date: 2018-01-31), 10-K (filing date: 2017-02-03), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-27).

The primary reason for the decrease in return on assets ratio (ROA) over 2018 year is the decrease in effect of taxes measured by tax burden ratio.

Disaggregation of Net Profit Margin

Comcast Corp., decomposition of net profit margin ratio

Microsoft Excel LibreOffice Calc
Net Profit Margin = Tax Burden × Interest Burden × EBIT Margin
Dec 31, 2018 12.41% = 0.78 × 0.81 × 19.74%
Dec 31, 2017 26.87% = 1.50 × 0.83 × 21.56%
Dec 31, 2016 10.81% = 0.62 × 0.83 × 21.08%
Dec 31, 2015 10.96% = 0.62 × 0.83 × 21.24%
Dec 31, 2014 12.18% = 0.68 × 0.82 × 21.62%

Based on: 10-K (filing date: 2019-01-31), 10-K (filing date: 2018-01-31), 10-K (filing date: 2017-02-03), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-27).

The primary reason for the decrease in net profit margin ratio over 2018 year is the decrease in effect of taxes measured by tax burden ratio.