diff --git a/src/systems/abstractsystem.jl b/src/systems/abstractsystem.jl
index c53c900d27..e565bb27e1 100644
--- a/src/systems/abstractsystem.jl
+++ b/src/systems/abstractsystem.jl
@@ -923,15 +923,14 @@ One property to note is that if a system is complete, the system will no longer
 namespace its subsystems or variables, i.e. `isequal(complete(sys).v.i, v.i)`.
 """
 function complete(sys::AbstractSystem; split = true, flatten = true)
-    if !(sys isa JumpSystem)
-        newunknowns = OrderedSet()
-        newparams = OrderedSet()
-        iv = has_iv(sys) ? get_iv(sys) : nothing
-        collect_scoped_vars!(newunknowns, newparams, sys, iv; depth = -1)
-        # don't update unknowns to not disturb `structural_simplify` order
-        # `GlobalScope`d unknowns will be picked up and added there
-        @set! sys.ps = unique!(vcat(get_ps(sys), collect(newparams)))
-    end
+    newunknowns = OrderedSet()
+    newparams = OrderedSet()
+    iv = has_iv(sys) ? get_iv(sys) : nothing
+    collect_scoped_vars!(newunknowns, newparams, sys, iv; depth = -1)
+    # don't update unknowns to not disturb `structural_simplify` order
+    # `GlobalScope`d unknowns will be picked up and added there
+    @set! sys.ps = unique!(vcat(get_ps(sys), collect(newparams)))
+
     if flatten
         eqs = equations(sys)
         if eqs isa AbstractArray && eltype(eqs) <: Equation
diff --git a/src/systems/jumps/jumpsystem.jl b/src/systems/jumps/jumpsystem.jl
index 6409609a10..9fa073b4b0 100644
--- a/src/systems/jumps/jumpsystem.jl
+++ b/src/systems/jumps/jumpsystem.jl
@@ -160,13 +160,40 @@ function JumpSystem(eqs, iv, unknowns, ps;
         metadata = nothing,
         gui_metadata = nothing,
         kwargs...)
+
+    # variable processing, similar to ODESystem
     name === nothing &&
         throw(ArgumentError("The `name` keyword must be provided. Please consider using the `@named` macro"))
-    eqs = scalarize.(eqs)
+    iv′ = value(iv)
+    us′ = value.(unknowns)
+    ps′ = value.(ps)
+    parameter_dependencies, ps′ = process_parameter_dependencies(
+        parameter_dependencies, ps′)
+    if !(isempty(default_u0) && isempty(default_p))
+        Base.depwarn(
+            "`default_u0` and `default_p` are deprecated. Use `defaults` instead.",
+            :JumpSystem, force = true)
+    end
+    defaults = Dict{Any, Any}(todict(defaults))
+    var_to_name = Dict()
+    process_variables!(var_to_name, defaults, us′)
+    process_variables!(var_to_name, defaults, ps′)
+    process_variables!(var_to_name, defaults, [eq.lhs for eq in parameter_dependencies])
+    process_variables!(var_to_name, defaults, [eq.rhs for eq in parameter_dependencies])
+    #! format: off
+    defaults = Dict{Any, Any}(value(k) => value(v) for (k, v) in pairs(defaults) if value(v) !== nothing)
+    #! format: on
+    isempty(observed) || collect_var_to_name!(var_to_name, (eq.lhs for eq in observed))
+
     sysnames = nameof.(systems)
     if length(unique(sysnames)) != length(sysnames)
         throw(ArgumentError("System names must be unique."))
     end
+
+    # equation processing
+    # this and the treatment of continuous events are the only part 
+    # unique to JumpSystems
+    eqs = scalarize.(eqs)
     ap = ArrayPartition(MassActionJump[], ConstantRateJump[], VariableRateJump[])
     for eq in eqs
         if eq isa MassActionJump
@@ -179,30 +206,42 @@ function JumpSystem(eqs, iv, unknowns, ps;
             error("JumpSystem equations must contain MassActionJumps, ConstantRateJumps, or VariableRateJumps.")
         end
     end
-    if !(isempty(default_u0) && isempty(default_p))
-        Base.depwarn(
-            "`default_u0` and `default_p` are deprecated. Use `defaults` instead.",
-            :JumpSystem, force = true)
-    end
-    defaults = todict(defaults)
-    defaults = Dict(value(k) => value(v)
-    for (k, v) in pairs(defaults) if value(v) !== nothing)
 
-    unknowns, ps = value.(unknowns), value.(ps)
-    var_to_name = Dict()
-    process_variables!(var_to_name, defaults, unknowns)
-    process_variables!(var_to_name, defaults, ps)
-    isempty(observed) || collect_var_to_name!(var_to_name, (eq.lhs for eq in observed))
     (continuous_events === nothing) ||
         error("JumpSystems currently only support discrete events.")
     disc_callbacks = SymbolicDiscreteCallbacks(discrete_events)
-    parameter_dependencies, ps = process_parameter_dependencies(parameter_dependencies, ps)
+
     JumpSystem{typeof(ap)}(Threads.atomic_add!(SYSTEM_COUNT, UInt(1)),
-        ap, value(iv), unknowns, ps, var_to_name, observed, name, description, systems,
+        ap, iv′, us′, ps′, var_to_name, observed, name, description, systems,
         defaults, connector_type, disc_callbacks, parameter_dependencies,
         metadata, gui_metadata, checks = checks)
 end
 
+##### MTK dispatches for JumpSystems #####
+eqtype_supports_collect_vars(j::MassActionJump) = true
+function collect_vars!(unknowns, parameters, j::MassActionJump, iv; depth = 0,
+        op = Differential)
+    collect_vars!(unknowns, parameters, j.scaled_rates, iv; depth, op)
+    for field in (j.reactant_stoch, j.net_stoch)
+        for el in field
+            collect_vars!(unknowns, parameters, el, iv; depth, op)
+        end
+    end
+    return nothing
+end
+
+eqtype_supports_collect_vars(j::Union{ConstantRateJump, VariableRateJump}) = true
+function collect_vars!(unknowns, parameters, j::Union{ConstantRateJump, VariableRateJump},
+        iv; depth = 0, op = Differential)
+    collect_vars!(unknowns, parameters, j.rate, iv; depth, op)
+    for eq in j.affect!
+        (eq isa Equation) && collect_vars!(unknowns, parameters, eq, iv; depth, op)
+    end
+    return nothing
+end
+
+##########################################
+
 has_massactionjumps(js::JumpSystem) = !isempty(equations(js).x[1])
 has_constantratejumps(js::JumpSystem) = !isempty(equations(js).x[2])
 has_variableratejumps(js::JumpSystem) = !isempty(equations(js).x[3])
@@ -240,9 +279,8 @@ function assemble_vrj(
 
     outputvars = (value(affect.lhs) for affect in vrj.affect!)
     outputidxs = [unknowntoid[var] for var in outputvars]
-    affect = eval_or_rgf(
-        generate_affect_function(js, vrj.affect!,
-            outputidxs); eval_expression, eval_module)
+    affect = eval_or_rgf(generate_affect_function(js, vrj.affect!, outputidxs);
+        eval_expression, eval_module)
     VariableRateJump(rate, affect)
 end
 
@@ -269,9 +307,8 @@ function assemble_crj(
 
     outputvars = (value(affect.lhs) for affect in crj.affect!)
     outputidxs = [unknowntoid[var] for var in outputvars]
-    affect = eval_or_rgf(
-        generate_affect_function(js, crj.affect!,
-            outputidxs); eval_expression, eval_module)
+    affect = eval_or_rgf(generate_affect_function(js, crj.affect!, outputidxs);
+        eval_expression, eval_module)
     ConstantRateJump(rate, affect)
 end
 
diff --git a/test/jumpsystem.jl b/test/jumpsystem.jl
index 24b9abbc8a..30cb636226 100644
--- a/test/jumpsystem.jl
+++ b/test/jumpsystem.jl
@@ -340,3 +340,85 @@ let
 
     @test all(abs.(cmean .- cmean2) .<= 0.05 .* cmean)
 end
+
+# collect_vars! tests for jumps
+let
+    @variables x1(t) x2(t) x3(t) x4(t) x5(t)
+    @parameters p1 p2 p3 p4 p5
+    j1 = ConstantRateJump(p1, [x1 ~ x1 + 1])
+    j2 = MassActionJump(p2, [x2 => 1], [x3 => -1])
+    j3 = VariableRateJump(p3, [x3 ~ x3 + 1, x4 ~ x4 + 1])
+    j4 = MassActionJump(p4 * p5, [x1 => 1, x5 => 1], [x1 => -1, x5 => -1, x2 => 1])
+    us = Set()
+    ps = Set()
+    iv = t
+
+    MT.collect_vars!(us, ps, j1, iv)
+    @test issetequal(us, [x1])
+    @test issetequal(ps, [p1])
+
+    empty!(us)
+    empty!(ps)
+    MT.collect_vars!(us, ps, j2, iv)
+    @test issetequal(us, [x2, x3])
+    @test issetequal(ps, [p2])
+
+    empty!(us)
+    empty!(ps)
+    MT.collect_vars!(us, ps, j3, iv)
+    @test issetequal(us, [x3, x4])
+    @test issetequal(ps, [p3])
+
+    empty!(us)
+    empty!(ps)
+    MT.collect_vars!(us, ps, j4, iv)
+    @test issetequal(us, [x1, x5, x2])
+    @test issetequal(ps, [p4, p5])
+end
+
+# scoping tests
+let
+    @variables x1(t) x2(t) x3(t) x4(t) x5(t)
+    x2 = ParentScope(x2)
+    x3 = ParentScope(ParentScope(x3))
+    x4 = DelayParentScope(x4, 2)
+    x5 = GlobalScope(x5)
+    @parameters p1 p2 p3 p4 p5
+    p2 = ParentScope(p2)
+    p3 = ParentScope(ParentScope(p3))
+    p4 = DelayParentScope(p4, 2)
+    p5 = GlobalScope(p5)
+
+    j1 = ConstantRateJump(p1, [x1 ~ x1 + 1])
+    j2 = MassActionJump(p2, [x2 => 1], [x3 => -1])
+    j3 = VariableRateJump(p3, [x3 ~ x3 + 1, x4 ~ x4 + 1])
+    j4 = MassActionJump(p4 * p5, [x1 => 1, x5 => 1], [x1 => -1, x5 => -1, x2 => 1])
+    @named js = JumpSystem([j1, j2, j3, j4], t, [x1, x2, x3, x4, x5], [p1, p2, p3, p4, p5])
+
+    us = Set()
+    ps = Set()
+    iv = t
+    MT.collect_scoped_vars!(us, ps, js, iv)
+    @test issetequal(us, [x2])
+    @test issetequal(ps, [p2])
+
+    empty!.((us, ps))
+    MT.collect_scoped_vars!(us, ps, js, iv; depth = 0)
+    @test issetequal(us, [x1])
+    @test issetequal(ps, [p1])
+
+    empty!.((us, ps))
+    MT.collect_scoped_vars!(us, ps, js, iv; depth = 1)
+    @test issetequal(us, [x2])
+    @test issetequal(ps, [p2])
+
+    empty!.((us, ps))
+    MT.collect_scoped_vars!(us, ps, js, iv; depth = 2)
+    @test issetequal(us, [x3, x4])
+    @test issetequal(ps, [p3, p4])
+
+    empty!.((us, ps))
+    MT.collect_scoped_vars!(us, ps, js, iv; depth = -1)
+    @test issetequal(us, [x5])
+    @test issetequal(ps, [p5])
+end