Hi @Erik77 our calculation for ROIC can be seen on the data item browser below:

From what I can see the industry standard calculation is as follows:

TR.ROICActValue = Net Operating Profit - Adjusted Taxes / Invested Capital

Note this is the basis on which brokers are reporting their estimates - so i would say that this is the industry standard accounting identity.

This is obviously different from the calculation you require. I think you would have to compute this yourself using the underlying data required for the calculation. The fields required for your calculation:

Net Income – Bottom Line: TR.InvtrNetIncome (I would suggest you use this field instead TR.F.IncAvailToComShr(Period=FY0) as it comes from the same fundamentals content set)

Interest Expense on Debt - Interest Capitalized: TR.F.IntrExpnNetOfCapIntr(Period=FY0)

Total Capital: TR.F.TotCap(Period=FY-1), TR.F.TotCap(Period=FY0)

Short Term Debt & Current Portion of Long Term Debt: TR.F.STDebtCurrPortOfLTDebt(Period=FY-1), TR.F.STDebtCurrPortOfLTDebt(Period=FY0)

Tax Rate: TR.F.EstTaxRate(Period=FY0)

You can then just download these:

df,err = ek.get_data('VOD.L',['TR.F.IncAvailToComShr(Period=FY0)','TR.F.IntrExpnNetOfCapIntr(Period=FY0)','TR.F.TotCap(Period=FY-1)','TR.F.TotCap(Period=FY0)','TR.F.STDebtCurrPortOfLTDebt(Period=FY-1)','TR.F.STDebtCurrPortOfLTDebt(Period=FY0)','TR.F.EstTaxRate(Period=FY0)'])

df

and plug in those to your formula.

I hope this can help.