Hi,

When I’m running my model, it gives me the following errors:

```
There are 12 eigenvalue(s) larger than 1 in modulus for 11 forward-looking variable(s)
The rank condition ISN'T verified!
Error using print_info (line 42)
Blanchard Kahn conditions are not satisfied: no stable equilibrium
Error in stoch_simul (line 98)
print_info(info, options_.noprint, options_);
Error in NK_lumpsumtaxes (line 379)
info = stoch_simul(var_list_);
Error in dynare (line 180)
evalin('base',fname) ;
```

I know this is not a new question and I checked all other questions and answers provided in the forum but still cannot figure out my problem. Here are the two equations causing the above problems:

```
var pi //inflation
r //gross nominal interest rate
y //real output
tau //lump-sum tax rate
b //real bond
gamma //trend growth rate of the economy
;
parameters gbar // constant govt spending
psi_tau // the sensitivity of taxes to real debt
rho_tau // tax persistence
sbbar // steady state govt debt to GDP ratio
taubar // steady state lump-sum tax rate
;
Model;
//. GBC
b + tau*y = (r(-1)/pi)*(b(-1)/exp(gamma)) + gbar;
//. Lump-sum tax
tau = (tau(-1)^rho_tau)*((taubar*(((b(-1)/y(-1))/sbbar)^psi_tau))^(1-rho_tau));
```

I didn’t use predetermined_variables command. I’m running a traditional NK model just like the NK_baseline.mod in examples. Before I introduced fiscal variables into the model, everything is fine. However, when I introduced the above two equations into the model, the errors show up. To make things simple, I set govt spending constant and only have lump-sum taxes. My tax rule follows Leeper’s specification to stabilize real debt, which includes a response of tax to real debt.

Is there anything wrong with the timing of debt? Or is the problem due to fiscal rule set-up or parameterization?

I can provide more information if you need.

Highly appreciate your help!

Best,